The invention discloses a high-stability fixture for an automobile tooling. The fixture comprises a baseplate, a positioning vertical plate, two guiding sliding rails and a sliding vertical plate, wherein the positioning vertical plate is fixedly connected onto the plate surface of the baseplate; the guiding sliding rails are fixedly connected onto the side wall of the positioning vertical plate;a connecting plate is fixedly connected between the guiding sliding rails; limiting sliding blocks are slidably connected into the guiding sliding rails and fixedly connected onto the bottom surface of the sliding vertical plate; positioning holes are formed in the surfaces of the guiding sliding rails; an air cylinder is fixedly connected onto the plate surface of the connecting plate between theguiding sliding rails; and a piston rod of the air cylinder is fixedly connected onto the bottom surface of a bearing-supporting plate. The bearing-supporting plate is arranged at the bottom of an automobile hub tooling fixture, namely the fixture provided by the invention, and the hub rim of a hub is limited through a hub limiting groove formed in the surface of the bearing-supporting plate, thereby avoiding the deviation of the hub rim during the detection process; and the automobile hub is supported through the bearing-supporting plate, thereby avoiding the situation that the hub falls offand damages a worker after the fixture is disassembled.