Lock catch mounting plate structure of back door of vehicle

The invention relates to a lock catch mounting plate structure of a back door of a vehicle, comprising a back skirting internal plate, a lock catch mounting plate, a nut plate and a reinforcing plate, wherein the lock catch mounting plate is connected with the nut plate through spot welding, and then is fixedly connected with the reinforcing plate and the back skirting internal plate through spot welding into an assembly structure, welding flanged edges connected with the back skirting internal plate are arranged on the four sides of the lock catch mounting plate, and technical gaps are formed on the four sides of the lock catch mounting plate. Compared with the prior art, on the basis of easy control of precision, easy qualification of rigidity and convenient adjustment of the assembly, the lock catch mounting plate structure ensures the mounting rigidity and intensity, and prevents the lock catch and lock body of the back door from generating abnormal sound due to low mounting intensity of the lock catch wh