The invention discloses a transmission mechanism suitable for an automobile steering gear wearing test device. The wearing test device comprises a first vertical arm, a connecting rod and a second vertical arm, wherein one end of the first vertical arm is connected with the main shaft of a swinging oil cylinder, the other end of the first vertical arm is rotationally connected with the connectingrod, one end of the second vertical arm is rotationally connected with the connecting rod, the other end of the second vertical arm is connected with a steering gear to be tested, the connecting rod comprises a first joint bearing, a connecting rod body, and a second joint bearing, the first joint bearing is rotationally connected with the first vertical arm through a rotating shaft, the rotatingshaft is provided with a pin which is a cotter pin, and the second joint bearing is rotationally connected with the second vertical arm. According to the transmission mechanism suitable for the automobile steering gear wearing test device, the force transmission of the steering gear in the test process is guaranteed, and it is guaranteed that the stress state is similar to the stress state of thesteering gear on the real vehicle, the real reliability of the detection process is improved, and the method is especially suitable for being used in the aspect of enterprise quality inspection.