Hanging bracket structure with self-locking device

The utility model provides a hanging bracket structure with a self-locking device, and belongs to the technical field of cable bridges. The lifting device comprises a stand column lifting arm and a supporting structure arranged on the stand column lifting arm, the supporting structure comprises a first supporting arm, a second supporting arm and a third supporting arm which are arranged on the stand column lifting arm, the first supporting arm is located between the second supporting arm and the third supporting arm, and sliding openings are formed in the top ends of the first supporting arm, the second supporting arm and the third supporting arm in a penetrating mode. The side wall of the top end and the side wall of the bottom end of the first supporting arm are each fixedly connected with two adjusting screw sleeves, the inner side walls of the four adjusting screw sleeves are each in threaded connection with an adjusting screw rod, and the ends, away from the first supporting arm, of the two adjusting scr