适用于 PowerShell 5.1 及以上版本
磁盘空间不足是运维中最常见的问题之一。日志文件堆积、临时文件未清理、回收站膨胀、Windows 更新缓存占用等问题，如果不加以管理，迟早会导致系统异常甚至服务中断。在容器化和虚拟化环境中，磁盘资源更是需要精打细算，自动化的磁盘清理机制必不可少。
手动清理磁盘既低效又容易遗漏，而且无法做到定期执行。通过 PowerShell 脚本可以精确定位各类可清理的目标，量化空间占用，并在安全的前提下自动执行清理操作。本文将介绍如何构建一个全面的磁盘清理自动化方案。
磁盘空间分析 在执行清理之前，需要先了解磁盘空间的使用情况以及哪些目录占用最多。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 function Get-DiskSpaceInfo [CmdletBinding ()] param ( [string ]$DriveLetter ) $drives = Get-CimInstance -ClassName Win32_LogicalDisk -Filter 'DriveType = 3' if ($DriveLetter ) { $drives = $drives | Where-Object { $_ .DeviceID -eq "$ ($DriveLetter ):" } } foreach ($drive in $drives ) { $totalGB = [math ]::Round($drive .Size / 1 GB, 2 ) $freeGB = [math ]::Round($drive .FreeSpace / 1 GB, 2 ) $usedGB = [math ]::Round(($drive .Size - $drive .FreeSpace) / 1 GB, 2 ) $usedPercent = [math ]::Round(($drive .Size - $drive .FreeSpace) / $drive .Size * 100 , 1 ) [PSCustomObject ]@ { Drive = $drive .DeviceID TotalGB = $totalGB UsedGB = $usedGB FreeGB = $freeGB UsedPercent = $usedPercent Status = if ($usedPercent -gt 90 ) { 'Critical' } elseif ($usedPercent -gt 80 ) { 'Warning' } else { 'OK' } } } } Get-DiskSpaceInfo | Format-Table -AutoSize
执行结果示例：
1 2 3 4 Drive TotalGB UsedGB FreeGB UsedPercent Status ----- ------- ------ ------ ----------- ------ C: 100 78.5 21.5 78.5 Warning D: 500 210.3 289.7 42.1 OK
分析目录空间占用 找出哪些目录占用空间最多，为清理提供依据。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 function Get-FolderSize [CmdletBinding ()] param ( [Parameter (Mandatory )] [string ]$Path , [int ]$Depth = 1 ) if (-not (Test-Path $Path )) { Write-Warning "路径不存在：$Path " return } $results = [System.Collections.Generic.List [PSObject ]]::new() $rootFiles = Get-ChildItem -Path $Path -File -Recurse -Force -ErrorAction SilentlyContinue $rootSize = ($rootFiles | Measure-Object -Property Length -Sum ).Sum $subDirs = Get-ChildItem -Path $Path -Directory -Force -ErrorAction SilentlyContinue foreach ($dir in $subDirs ) { $files = Get-ChildItem -Path $dir .FullName -File -Recurse -Force -ErrorAction SilentlyContinue $size = ($files | Measure-Object -Property Length -Sum ).Sum $fileCount = ($files | Measure-Object ).Count $results .Add([PSCustomObject ]@ { Folder = $dir .Name SizeMB = [math ]::Round($size / 1 MB, 2 ) FileCount = $fileCount FullPath = $dir .FullName }) } $results | Sort-Object SizeMB -Descending } $commonPaths = @ ( @ { Name = '临时文件' ; Path = $env:TEMP } @ { Name = 'Windows 临时' ; Path = 'C:\Windows\Temp' } @ { Name = '回收站' ; Path = 'C:\`$Recycle.Bin' } @ { Name = 'Windows 更新' ; Path = 'C:\Windows\SoftwareDistribution' } ) foreach ($item in $commonPaths ) { Write-Host "`n--- $ ($item .Name) ---" -ForegroundColor Cyan Get-FolderSize -Path $item .Path | Select-Object -First 5 | Format-Table -AutoSize }
执行结果示例：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 --- 临时文件 --- Folder SizeMB FileCount FullPath ------ ------ --------- -------- Logs 512.3 1245 C:\Users\admin\AppData\Local\Temp\Logs Cache 256.8 890 C:\Users\admin\AppData\Local\Temp\Cache Extraction 128.1 45 C:\Users\admin\AppData\Local\Temp\Extraction --- Windows 临时 --- Folder SizeMB FileCount FullPath ------ ------ --------- -------- UpdateStaging 890.5 3200 C:\Windows\Temp\UpdateStaging InstallCache 345.2 678 C:\Windows\Temp\InstallCache
清理临时文件 临时文件是最常见的空间占用来源。以下函数可以安全清理各类临时文件。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 function Remove-TempFiles [CmdletBinding (SupportsShouldProcess )] param ( [Parameter (Mandatory )] [string []]$Path , [int ]$MaxAge = 7 , [string []]$Extensions , [switch ]$Force ) $cutoffDate = (Get-Date ).AddDays(-$MaxAge ) $totalSize = 0 $totalFiles = 0 foreach ($targetPath in $Path ) { if (-not (Test-Path $targetPath )) { Write-Verbose "路径不存在，跳过：$targetPath " continue } Write-Verbose "扫描目录：$targetPath " $files = Get-ChildItem -Path $targetPath -File -Recurse -Force -ErrorAction SilentlyContinue | Where-Object { $_ .LastWriteTime -lt $cutoffDate } if ($Extensions ) { $files = $files | Where-Object { $Extensions -contains $_ .Extension.ToLower() } } foreach ($file in $files ) { $totalSize += $file .Length $totalFiles ++ if ($PSCmdlet .ShouldProcess($file .FullName, '删除文件' )) { try { Remove-Item -Path $file .FullName -Force -ErrorAction Stop Write-Verbose "已删除：$ ($file .FullName)" } catch { Write-Warning "删除失败：$ ($file .FullName) - $ ($_ .Exception.Message)" } } } } [PSCustomObject ]@ { FilesDeleted = $totalFiles SpaceFreedMB = [math ]::Round($totalSize / 1 MB, 2 ) SpaceFreedGB = [math ]::Round($totalSize / 1 GB, 2 ) CutoffDate = $cutoffDate } } $result = Remove-TempFiles -Path @ ( $env:TEMP 'C:\Windows\Temp' ) -MaxAge 7 -Verbose Write-Host "`n清理结果：" $result | Format-List
执行结果示例：
1 2 3 4 5 6 7 8 9 10 11 详细: 扫描目录：C:\Users\admin\AppData\Local\Temp 详细: 已删除：C:\Users\admin\AppData\Local\Temp\Logs\app-20250810.log 详细: 已删除：C:\Users\admin\AppData\Local\Temp\Cache\data-20250809.tmp 详细: 扫描目录：C:\Windows\Temp 详细: 已删除：C:\Windows\Temp\UpdateStaging\patch-20250811.cab 清理结果： FilesDeleted : 2456 SpaceFreedMB : 1024.5 SpaceFreedGB : 1.0 CutoffDate : 2025/8/13 8:00:00
清理日志文件 日志文件是另一个重要的空间占用来源，需要按策略进行归档和清理。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 function Remove-OldLogFiles [CmdletBinding (SupportsShouldProcess )] param ( [Parameter (Mandatory )] [string ]$LogPath , [int ]$MaxAge = 30 , [string ]$ArchivePath , [string ]$Pattern = '*.log' ) if (-not (Test-Path $LogPath )) { throw "日志目录不存在：$LogPath " } $cutoffDate = (Get-Date ).AddDays(-$MaxAge ) $files = Get-ChildItem -Path $LogPath -Filter $Pattern -File -Force | Where-Object { $_ .LastWriteTime -lt $cutoffDate } $stats = @ { Archived = 0 Deleted = 0 TotalSizeMB = 0 } foreach ($file in $files ) { $stats ['TotalSizeMB' ] += $file .Length / 1 MB if ($ArchivePath ) { if (-not (Test-Path $ArchivePath )) { New-Item -Path $ArchivePath -ItemType Directory -Force | Out-Null } $zipName = "$ ($file .BaseName)-$ (Get-Date -Format 'yyyyMMdd').zip" $zipPath = Join-Path $ArchivePath $zipName if ($PSCmdlet .ShouldProcess($file .FullName, "归档到 $zipPath " )) { Compress-Archive -Path $file .FullName -DestinationPath $zipPath -Force Remove-Item -Path $file .FullName -Force $stats ['Archived' ]++ Write-Verbose "已归档：$ ($file .Name) -> $zipName " } } else { if ($PSCmdlet .ShouldProcess($file .FullName, '删除' )) { Remove-Item -Path $file .FullName -Force $stats ['Deleted' ]++ Write-Verbose "已删除：$ ($file .Name)" } } } [PSCustomObject ]@ { LogPath = $LogPath MaxAge = $MaxAge CutoffDate = $cutoffDate FilesCount = $files .Count Archived = $stats ['Archived' ] Deleted = $stats ['Deleted' ] SizeMB = [math ]::Round($stats ['TotalSizeMB' ], 2 ) } } $logResult = Remove-OldLogFiles ` -LogPath 'C:\inetpub\logs\LogFiles\W3SVC1' ` -MaxAge 30 ` -ArchivePath 'D:\Archive\IISLogs' ` -Verbose $logResult | Format-List
执行结果示例：
1 2 3 4 5 6 7 8 9 10 11 详细: 已归档：u_ex250715.log -> u_ex250715-20250820.zip 详细: 已归档：u_ex250716.log -> u_ex250716-20250820.zip 详细: 已归档：u_ex250717.log -> u_ex250717-20250820.zip LogPath : C:\inetpub\logs\LogFiles\W3SVC1 MaxAge : 30 CutoffDate : 2025/7/21 8:00:00 FilesCount : 15 Archived : 15 Deleted : 0 SizeMB : 2048.5
清理 Windows 更新缓存和系统文件 Windows 更新下载的文件和系统组件缓存往往占用大量空间。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 function Remove-WindowsUpdateCache [CmdletBinding (SupportsShouldProcess )] param () $wuService = 'wuauserv' Write-Verbose "停止 Windows Update 服务..." Stop-Service -Name $wuService -Force -ErrorAction SilentlyContinue $cachePaths = @ ( 'C:\Windows\SoftwareDistribution\Download' 'C:\Windows\SoftwareDistribution\DataStore' ) $totalFreed = 0 foreach ($path in $cachePaths ) { if (Test-Path $path ) { $files = Get-ChildItem -Path $path -Recurse -Force -ErrorAction SilentlyContinue $size = ($files | Measure-Object -Property Length -Sum ).Sum $totalFreed += $size if ($PSCmdlet .ShouldProcess($path , '清理目录内容' )) { Get-ChildItem -Path $path -Force | Remove-Item -Recurse -Force -ErrorAction SilentlyContinue Write-Verbose "已清理：$path ($ ([math]::Round($size / 1MB, 2)) MB)" } } } Write-Verbose "启动 Windows Update 服务..." Start-Service -Name $wuService -ErrorAction SilentlyContinue [PSCustomObject ]@ { CacheCleaned = $cachePaths SpaceFreedMB = [math ]::Round($totalFreed / 1 MB, 2 ) ServiceState = (Get-Service -Name $wuService ).Status } } $updateResult = Remove-WindowsUpdateCache -Verbose $updateResult | Format-List
执行结果示例：
1 2 3 4 5 6 7 8 详细: 停止 Windows Update 服务... 详细: 已清理：C:\Windows\SoftwareDistribution\Download (3456.78 MB) 详细: 已清理：C:\Windows\SoftwareDistribution\DataStore (234.5 MB) 详细: 启动 Windows Update 服务... CacheCleaned : {C:\Windows\SoftwareDistribution\Download, C:\Windows\SoftwareDistribution\DataStore} SpaceFreedMB : 3691.28 ServiceState : Running
综合清理工作流 将各类清理操作整合为一个可定期执行的综合脚本。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 function Invoke-DiskCleanup [CmdletBinding ()] param ( [string ]$DriveLetter = 'C' , [int ]$TempFileMaxAge = 7 , [int ]$LogFileMaxAge = 30 , [switch ]$CleanUpdateCache ) Write-Host "===== 磁盘清理开始 =====" -ForegroundColor Cyan Write-Host "目标驱动器：$ ($DriveLetter ):" Write-Host "执行时间：$ (Get-Date -Format 'yyyy-MM-dd HH:mm:ss')" $before = Get-DiskSpaceInfo -DriveLetter $DriveLetter Write-Host "`n清理前可用空间：$ ($before .FreeGB) GB" -ForegroundColor Yellow $results = [System.Collections.Generic.List [PSObject ]]::new() Write-Host "`n[1/4] 清理临时文件..." -ForegroundColor Cyan $tempResult = Remove-TempFiles -Path @ ( $env:TEMP 'C:\Windows\Temp' ) -MaxAge $TempFileMaxAge $results .Add($tempResult ) Write-Host " 已删除 $ ($tempResult .FilesDeleted) 个文件，释放 $ ($tempResult .SpaceFreedMB) MB" Write-Host "`n[2/4] 清理日志文件..." -ForegroundColor Cyan $logPaths = @ ( 'C:\inetpub\logs\LogFiles' 'C:\Windows\Logs' ) foreach ($logPath in $logPaths ) { if (Test-Path $logPath ) { $logResult = Remove-OldLogFiles -LogPath $logPath -MaxAge $LogFileMaxAge $results .Add($logResult ) Write-Host " 清理 $logPath - $ ($logResult .SizeMB) MB" } } Write-Host "`n[3/4] 清空回收站..." -ForegroundColor Cyan try { Clear-RecycleBin -DriveLetter $DriveLetter -Force -ErrorAction Stop Write-Host " 回收站已清空" } catch { Write-Warning "清空回收站失败：$_ " } if ($CleanUpdateCache ) { Write-Host "`n[4/4] 清理 Windows 更新缓存..." -ForegroundColor Cyan $wuResult = Remove-WindowsUpdateCache $results .Add($wuResult ) Write-Host " 释放 $ ($wuResult .SpaceFreedMB) MB" } else { Write-Host "`n[4/4] 跳过 Windows 更新缓存清理" -ForegroundColor Gray } $after = Get-DiskSpaceInfo -DriveLetter $DriveLetter $freedGB = [math ]::Round($after .FreeGB - $before .FreeGB, 2 ) Write-Host "`n===== 清理完成 =====" -ForegroundColor Green Write-Host "清理前可用空间：$ ($before .FreeGB) GB" Write-Host "清理后可用空间：$ ($after .FreeGB) GB" Write-Host "释放空间：$freedGB GB" -ForegroundColor Green [PSCustomObject ]@ { Drive = "$ ($DriveLetter ):" BeforeGB = $before .FreeGB AfterGB = $after .FreeGB FreedGB = $freedGB Results = $results ExecutedAt = Get-Date } } $cleanupReport = Invoke-DiskCleanup -DriveLetter 'C' -TempFileMaxAge 7 -LogFileMaxAge 30 -CleanUpdateCache
执行结果示例：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 ===== 磁盘清理开始 ===== 目标驱动器：C: 执行时间：2025-08-20 08:00:00 清理前可用空间：21.5 GB [1/4] 清理临时文件... 已删除 2456 个文件，释放 1024.5 MB [2/4] 清理日志文件... 清理 C:\inetpub\logs\LogFiles - 2048.5 MB 清理 C:\Windows\Logs - 128.3 MB [3/4] 清空回收站... 回收站已清空 [4/4] 清理 Windows 更新缓存... 释放 3691.28 MB ===== 清理完成 ===== 清理前可用空间：21.5 GB 清理后可用空间：27.27 GB 释放空间：5.77 GB
注意事项
备份优先 ：清理前务必备份重要的日志和配置文件，特别是生产环境的 IIS 日志、应用程序日志等，确认不再需要后再清理。文件锁定 ：正在使用的文件无法删除，脚本中应使用 -ErrorAction SilentlyContinue 跳过这些文件，避免因个别文件锁定导致整个脚本中断。服务依赖 ：清理 Windows 更新缓存需要停止 wuauserv 服务，如果组织有补丁管理窗口，应在窗口外执行此操作，避免影响正常更新流程。测试先行 ：在生产环境运行清理脚本前，先使用 -WhatIf 参数进行干运行（dry run），确认清理范围符合预期后再实际执行。定期执行 ：建议将清理脚本配置为计划任务，每周或每月自动执行，避免一次性积累过多文件导致清理时间过长。监控告警 ：配合磁盘空间监控（如当可用空间低于 20% 时告警），形成”监控-告警-清理”的闭环管理，避免磁盘空间耗尽导致的系统故障。