If you want to cancel or delete all your sent facebook friend requests there is no automated option on facebook, you can do it one by one, or you can use the following method and it will cancel your facebook sent friend requests in bulk. This example will use Google Chrome, but you also can do it in Firefox or other browsers.
- Go to this webpage with Chrome
- Right-click with your mouse on the page and select Inspect
- Now go to Console tab in chrome and paste this script.
4. Now hit enter and all the friend requests from the open page will be automatically cancelled, reload the page or scroll down to load more friend requests then paste again the script to repeat the process until all the friend requests will be cancelled.