The invention relates to a motor vehicle wheel steering angle tester with a loading device, belonging to a motor vehicle performance testing device. The tester consists of a terminal disc, a ball bearing, a substrate, a slide rod mechanism, a shaft, the loading device, a steering angle sensor and a measurement and control system. The invention simulates different steering resisting forces by controlling the loading device, measures the motor vehicle wheel steering angle under the characteristic of different steering resisting force, and better reflects the steering characteristic of the motorvehicle under different road conditions. The attached drawing is the structure drawing of the invention.