Folding wheelchair self-locking structure and folding wheelchair applying same

The utility model discloses a self-locking structure of a folding wheelchair and the folding wheelchair applying the self-locking structure. The self-locking structure of the folding wheelchair comprises a front wheel carrier, a rear wheel carrier, a back frame and a limiting rod, the back frame is provided with a back frame connecting pipe, the tail end of the back frame connecting pipe is bent towards the front side, and a hinge seat is arranged at the near end of the tail end of the back frame connecting pipe; the front wheel frame is provided with a front wheel connecting pipe which is hinged to the hinge seat; a self-locking groove is formed in the top of the rear wheel frame, the tail end of the back frame connecting pipe is hinged to the groove wall of the self-locking groove, a buckle groove matched with the back frame connecting pipe is formed in the groove bottom of the self-locking groove, and the buckle groove is located on the rear side of the hinged position of the back frame connecting pipe and