Rear torsion beam of automobile chassis

The utility model relates to the technical field of automobile accessories, and discloses an automobile chassis rear torsion beam which comprises a rear torsion cross beam, and a cross beam pipe is installed in the rear torsion cross beam. According to the utility model, materials at the welding matching positions of the shock absorber mounting bracket and the rear torsion cross beam are increased, so that the undercut phenomenon is avoided during welding, reworking treatment is not needed in the subsequent process, and the deformation of a product caused by welding material pulling is avoided by increasing the welding matching positions of the shock absorber mounting bracket and the rear torsion cross beam, so that the production efficiency is improved. The bending angle can be increased by inwards deviating the bending part of the shock absorber mounting bracket by 3mm, so that reinforcing ribs of the shock absorber mounting bracket are increased, and in the production process, the bending springback of a p