Automobile seat backrest lock catch

The utility model relates to an automobile seat backrest lock catch. The lock catch comprises a vehicle body welding part, a horizontal connecting part, a first fillet connecting part, a second filletconnecting part and a backrest buckling part; the two vehicle body welding parts are symmetrically arranged in the horizontal direction, the bottom ends of the vehicle body welding parts are perpendicularly, coaxially and tightly connected with the horizontal ends of the horizontal connecting parts through first fillet connecting parts, and the horizontal connecting parts are arranged in the horizontal direction. The backrest buckling part comprises two inclined connecting rods and a horizontal connecting rod, the two inclined connecting rods are symmetrically arranged in the horizontal direction, and the two horizontal ends of the horizontal connecting rod are coaxially and tightly connected with one ends of the inclined connecting rods through second fillet connecting parts; and the other horizontal end of the