Deep within the OS is a backup copy of the OneDriver installer. To find it, go to  File Explorer> This PC and open the system drive where Windows 10 is installed (usually C:\). Open the Windows folder and then open the WinSxS folder. In the search box, type onedrive then wait until the OneDriveSetup setup file appears.

Once you find it, double-click it to begin setup and you should be on your way to reinstalling OneDrive.

=============Uninstall===============

Don’t forget, you can uninstall OneDrive, too. For users who don’t want to be nagged by a feature they aren’t using, you can keep it off your system by opening Start > Settings > Apps > Apps & features. Scroll down to Microsoft OneDrive, select it then click Uninstall.

===========lINK:

https://support.office.com/zh-cn/article/%E9%80%82%E7%94%A8%E4%BA%8E-windows-%E7%9A%84-onedrive-%E6%A1%8C%E9%9D%A2%E5%BA%94%E7%94%A8%E7%A8%8B%E5%BA%8F-850703dd-ea56-4c7a-bff5-6c2e4da227cf

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