When a file or folder is deleted from Google Drive, it is not permanent deleted. Instead, it is sent to the system’s trash folder. If this file or folder was deleted by accident, you may restore your content in a few simple clicks.

How To Restore a Trashed File on Google Drive

Step 1.  Login to your Google Drive

Step 2.  Select Trash on the left side menu

Step 3.  Right click on the file you want to restore and select Restore