How do i cancel all my pending friend requests on facebook

If you are not able to send friend request to any more. Which means you have send lots of friends request and it not yet accepted.

You cant send any more request because it all pending for approval.
If you cancel all pending request which are tot accepted, then you can send new request.

Follow the step to cancel all pending request:

• Login to your Facebook account
• Go to your Profile
• Go to Activities
•  In activity screen you can see all your activities.
• here you can see friend request send 
• you can visit to the particular user 
• and you cancel send request