The invention relates to an automobile steering device bearing testing machine. The automobile steering device bearing testing machine comprises an engine base, a bearing supporting base, a main shaft device, a radial loading device and an axial loading device. The main shaft device comprises a rotary main shaft and a main shaft driving motor, a bearing to be tested is installed on the rotary main shaft and is fixed on the bearing supporting base, the radial loading device comprises a loading sleeve and a radial loading transmission mechanism, the loading sleeve is in running fit with the rotary main shaft, the radial loading terminal of the radial loading transmission mechanism abuts against the loading sleeve and applies a radial alternating load, the axial loading device comprises an axial loading terminal and an axial loading transmission mechanism, the axial loading terminal is in contact fit with the rotary main shaft in the axial direction of the rotary main shaft and is in running fit with the rotary main shaft in the rotating direction of the rotary main shaft, and the axial loading device can abut against the rotary main shaft in two directions along the axial direction of the rotary main shaft in order to apply an alternating load to the rotary main shaft in the axial direction. The working condition simulation of the steering device bearing is achieved, and the test of the service life can be carried out reliably and accurately.