Lock catch structure and folding wheelchair

The utility model belongs to the technical field of wheelchairs, and particularly relates to a lock catch structure and a folding wheelchair. In order to overcome the defect that a lock catch structure for connecting a backrest and a bottom frame of an existing folding wheelchair is not reasonable, the technical scheme adopted by the utility model is as follows: the lock catch structure comprises a positioning piece which is fixed on the bottom frame and is provided with a driving positioning groove and a folding positioning groove; the mounting seat is fixed on the backrest; the lock catch assembly comprises a handle rotatably arranged on the mounting seat, a positioning rod fixedly connected with the handle, and a torsional spring for generating acting force towards the positioning piece on the handle; the lock catch assembly is rotated by overcoming the acting force of the torsional spring, so that the positioning rod is moved out of the driving positioning groove and the folding positioning groove. The lo