Automatic positioning and locking device for lifting equipment

The invention discloses an automatic positioning and locking device for lifting equipment. The automatic positioning and locking device comprises a supporting pipe and a supporting rod, the inner wall of the supporting pipe is connected to the outer wall of the supporting rod in a sliding mode, locking mechanisms used for limiting and locking the supporting rod are fixedly installed on the outer walls of the two sides of the supporting pipe, a length positioning device is fixedly connected to one end of the supporting rod, and the locking mechanism internally comprises a driving assembly and a locking assembly. According to the automatic positioning and locking device, through an arranged rubber bag, when a locking arc-shaped sheet gets close to the supporting rod along an inner movable groove, a pressing plate on the outer wall of a connecting plate can press an air bag, then the air bag is extruded, air in the air bag is conveyed into the rubber bag along an air pipe, so that the rubber bag is expanded, the