The utility model relates to the field of a vehicle, in particular to a connecting device for a vehicle-mounted frame. The connecting device for the vehicle-mounted frame comprises a connecting band, a movable buckle and a hook. The movable buckle is arranged on the vehicle-mounted frame. One end of the connecting band is connected with the movable buckle and the other end of the connecting band is connected with the hook. The utility model provides the connecting device for the vehicle-mounted frame, which has simple and firm structure and is convenient to regulate.