Is this grammar correct Kindly find attached file that you asked me to send it for you?

The grammar is not quite correct. Here's a better way to phrase it:

"Please find the attached file that you requested."

Here's why the original sentence is incorrect:

* "Kindly find" is a bit formal and could be replaced with a more direct "Please find."

* "Attached file that you asked me to send it for you" is unnecessarily wordy and confusing. "That you requested" is a more concise way to express the same thing.

The revised sentence is clear, concise, and grammatically correct.