I need to file 1751 form to removed my permanent resident card, but I am divorced.

You will need to seek a waiver of the joint filing requirement. You could request a waiver if your marriage was entered in good faith but simply ended in divorce. You will need to establish your marriage was in good faith. You should also be prepared to be interviewed. You can read more about the process at http://myattorneyusa.com/seeking-waiver-of-joint-filing-requirement-of-uscis-from-i-751. This is a situation where it is best to work with an experienced immigration attorney.