The invention discloses a bullet train chassis oxidization film automatic grinding system. The bullet train chassis oxidization film automatic grinding system comprises a moving device, a grinding device and a workbench; the moving device, a vehicle body supported by the moving device, and a workpiece extending out along the workbench and composed of a bullet train chassis oxidization film are arranged on the workbench; the moving device comprises a driving wheel assembly, a driven wheel assembly and an automatic guiding assembly; the grinding device comprises a plurality of steel wire steelsarranged on the moving device; and each steel wire wheel is drive by a grinding motor, constant force is loaded for the grinding device through a counter weight at a constant mass, and the grinding device is pressed of the machined surface of the workpiece, and therefore grinding on the surface of the workpiece is achieved. According to the bullet train chassis oxidization film grinding device, due to the fact that the constant force and a constant rotating speed are adopted for machining the to-be-machined surface, the machining quality of the machined surface is uniform, the surface roughness meets the grinding requirement, the whole grinding process is controlled by a PLC, and the production efficiency is effectively improved.