The invention belongs to the field of electric automobile battery changing and relates to a full-automatic battery changing robot for an electric automobile. The battery changing robot comprises a movable chassis, wherein a main robot body is installed on the chassis, a battery changing jig is installed in the main robot body, the main robot body comprises a main frame and a lifting device. The bottom end of the main frame is fixed to the chassis, and the lifting device is installed at the top end of the main frame. The lifting device is connected with the battery changing jig. The battery changing jig comprises a jig lifting frame, a jig body, a pallet fork and a push-and-pull mechanism. The jig lifting frame is connected with the lifting device. The jig body is connected with the jig lifting frame through a direction turning mechanism. The pallet fork is connected with the jig body through a pitching mechanism. The push-and-pull mechanism is installed on the pallet fork, and a battery unlocking mechanism is arranged on the push-and-pull mechanism. The full-automatic battery changing robot achieves rapid and full-automatic change of batteries on two sides of the electric automobile, the battery changing efficiency is greatly improved compared with traditional semi-automatic change or single-shaft one-by-one motion, and the battery changing success rate is high.