How to cancel all friend request pending on Facebook?

Open Facebook and login with your details.

Then Click Here

It will display all your pending sent requests.
Open "Inspect" by Right click on the same page.

Now Go to "console" in top tabs and hit below script.

javascript:var inputs = document.getElementsByClassName('_54k8 _56bs _56bt');
 for(var i=0; i<inputs.length;i++) {
 inputs[i].click();

}

That's all, all your requests open on that page will be deleted.

(Note: Just ensure to scroll down till all list gets over, this will delete all open requests on the page)

And Then All Clear

It is Simple as :)
but you must go to “https://m.facebook.com/friends/center/requests/outgoing/#friends_center_main” the mobile site

and use the console

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