There is a feature in Facebook that allows you to find out who has recently added in your friend’s list or not. To find out the query you need to follow these steps:
1. Launch your Facebook app
2. Then click on the “Menu icon” in the corner of the screen.
3. Click on your name
4. Scroll down and click on “See all friends”
5. At the last, click on the “Recent” to see new added friends.
Here is the answer of your query "How to find recently added friends on Facebook"