有用科技小编2026/06/23
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阅读10分钟Windows.old 是系统升级后自动保留的旧版本文件夹，通常位于 C:\Windows.old，占用约 20 GB 空间。确认新系统运行正常、不再需要回退后，可通过磁盘清理、存储感知、命令提示符或软件工具安全彻底地删除它。
以下 4 种方法在 Windows 10/11 实测可用，按从易到难排列，删掉即停，无需全部执行。
适用系统：Windows 10/11；最后更新：2026-06-22。
Windows.old 清理升级残留是什么情况
升级 Windows 10 或 Windows 11 后，系统会自动把旧版本的完整文件保存在 C:\Windows.old 目录，用于在 10 天内提供"回退到旧版本"的快速通道。这个文件夹通常体积在 15–25 GB 之间，升级后 C 盘告急往往就是它造成的。超过 10 天后，Windows 不再提供一键回退功能，但 Windows.old 不会自动删除——需要手动清理才能释放空间。
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判断清楚自己的情况再动手：新系统已稳定运行超过几天就可以放心清理，清理后无法再用系统设置里的"回退"按钮，只能重新全新安装旧版本。
方法一 磁盘清理（推荐首选）
系统内置的磁盘清理工具带有"清理系统文件"选项，可以识别并删除 Windows.old，操作直观、安全，适合大多数用户。
操作步骤
- 打开"此电脑"，右键点击 C 盘，选择"属性"。
- 在"常规"选项卡中点击"磁盘清理"按钮，等待分析完成。
- 点击"清理系统文件"，再次等待分析（此步骤需管理员权限）。
- 在文件列表中勾选"以前的 Windows 安装"（对应
Windows.old），确认后点击"确定"→"删除文件"。
勾选"以前的 Windows 安装"后，右侧会显示该项占用的实际空间，一般在 15 GB 以上，点击确定后系统会自动完成删除。
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方法二 存储感知（设置中操作）
Windows 10 1809 及更高版本的"存储感知"功能提供了删除旧版本 Windows 的开关，适合习惯在设置界面操作的用户。
操作步骤
- 按
Win + I打开"设置"，进入"系统"→"存储"。 - 点击"配置存储感知或立即运行"（Windows 11 中显示为"存储感知"展开项）。
- 勾选"删除以前版本的 Windows"，然后点击"立即清理"。
- 等待进度条完成，系统提示清理完毕即可。
若"删除以前版本的 Windows"选项显示为灰色，说明 Windows.old 已不存在或已超出系统维护期，无需操作。
方法三 命令提示符强制删除
当磁盘清理无法显示"以前的 Windows 安装"选项时，可以用管理员权限的命令提示符通过 rd 命令直接删除文件夹，适合对命令行有一定了解的用户。
操作步骤
- 按
Win + S搜索"cmd"，右键以管理员身份运行命令提示符。 - 输入以下命令并回车：
rd /s /q C:\Windows.old - 等待命令执行完毕（无任何输出即为成功），期间不要关闭窗口。
- 打开文件资源管理器确认
C:\Windows.old文件夹已消失。
若提示"访问被拒绝"（Access is denied），说明文件夹中部分文件还被系统进程占用，此时推荐改用方法一的磁盘清理工具，由系统自行调度删除。
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方法四 用「软领Windows优化大师」更省事
软领Windows优化大师的 C盘瘦身 功能可以扫描出系统升级残留、临时文件、垃圾缓存等多个来源的可清理空间，一次操作就能同时处理 Windows.old 和其他 C 盘占用，省去手动逐项勾选的麻烦。
软领是知名国产软件品牌，20 年技术沉淀、服务千万用户，官网 wyouhua.com 直接下载，安装无捆绑勾选项。软件界面上有客服按钮，点一下就能联系到真人客服帮你解决电脑问题，复杂情况还有专业工程师远程协助。
垃圾清理功能还能同步处理系统临时文件夹（C:\Windows\Temp）和用户缓存，清完 C 盘通常还能多腾出几 GB，配合 C盘瘦身 一起用效果更明显。
常见问题
Windows.old 删除后还能回退旧系统吗？
不能。删除 Windows.old 后，系统设置里的"回退到上一版本"选项会变灰或消失。如果之后确实需要旧版本系统，只能通过 U 盘重新全新安装，建议确认新系统稳定运行一周后再清理。
Windows.old 10 天后会自动删除吗？
不会自动删除。Windows 只是在升级后 10 天内提供"回退"功能，文件本身不会被系统主动删除，需要用磁盘清理或存储感知手动触发。
磁盘清理没有"以前的 Windows 安装"选项怎么办？
可能是 Windows.old 已经被删除，或者磁盘清理没有以管理员身份运行。确保在点击"磁盘清理"后还要额外点"清理系统文件"，系统才会扫描出这一项。
Windows.old 一般占多大空间？
通常在 15–25 GB 之间，具体取决于旧版本系统的体积。从 Windows 10 升级到 Windows 11 的残留通常接近 20 GB；从 Windows 10 某个版本升级到更新版本的残留则可能小一些，约 8–15 GB。
C 盘还是不够用，清完 Windows.old 还有什么可以清？
可以继续清理 C:\Windows\Temp 临时文件夹、浏览器缓存、大型软件的安装包缓存（如 C:\Users\用户名\AppData\Local 下的缓存目录），或用软领Windows优化大师的大文件清理功能定位 C 盘里体积最大的文件逐一处理。
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