The invention belongs to automobile performance testing equipment. The invention aims to fill in a technical gap in a field of automatic detection for a sideslip between shafts of a multiple-steering-shaft automobile, and realizes simultaneous detection for the sideslips between wheels and shafts of the multiple-steering-shaft automobile. The invention provides a testing platform and a testing and adjusting integrated device for the steering wheel side force of the multiple-steering-shaft automobile. Automotive steering wheels are driven onto the testing platform. Two automobile fixing device assemblies fix an automobile frame. Through a floating pavement simulating mechanism in the testing platform, the automotive steering wheels are driven to rotate, and the side force which is generated in rotation of the automotive steering wheels is transmitted to two side force testing sensors through a floating pavement simulating mechanism, thereby testing the side force of each steering wheel, making technical personnel adjust the transverse pull rod and the longitudinal pull rod of the automobile according to the testing result in a targeted manner, and finishing detection and adjustment for the side force of the automotive steering wheels.