Plate lifting appliance with self-locking function

The utility model relates to the technical field of plate production, in particular to a plate lifting appliance with a self-locking function, which comprises a lifting appliance main body, a locking mechanism is arranged on the inner wall of the lifting appliance main body, a servo motor is fixedly connected to the top of the lifting appliance main body, a side plate is fixedly connected to the top of the lifting appliance main body, an inner angle bolt is in threaded connection with the inner wall of the side plate, and the inner wall of the inner angle bolt is in threaded connection with the lifting appliance main body. And the outer wall of the interior angle bolt is in threaded connection with a cross rod. An external power source of a servo motor is connected, the servo motor drives a rotating plate to rotate when working, the rotating plate drives connecting rods on the two sides to move, clamping plates are limited by a lifting appliance body, the connecting rods drive the clamping plates to move inwa