This invention provides an integrated chair frame motor transmission assembly for adjusting the position of a chair backrest bracket, including a bracket. A fixing part fixed to the chair frame is arranged at an upper end and a lower end of the bracket. A motor speed reducing module is fixed to the bracket, and one end of a screw rod is connected to the motor speed reducing module. The other end of the screw rod is connected to a fixing block, and the fixing block is fixed to the bracket. A sliding groove is formed in the bracket, and a sliding block is arranged corresponding to the sliding groove. The screw rod is matched with and connected to the sliding block and drives the sliding block to move back and forth along the sliding groove.