The invention belongs to the technical field of automobile parts, and particularly relates to a bumper based on spring energy absorption buffering. The bumper comprises a cross beam, a connecting block, an elastic piece, a supporting piece and a fixing piece; when the cross beam is impacted, impact force is transmitted to the connecting piece and then transmitted to the elastic piece, then the elastic piece is compressed, impact energy is absorbed through deformation of the elastic piece, due to the elasticity characteristic of the elastic piece, the shape of the elastic piece is easily changed in the whole anti-collision beam structure, therefore, the impact energy can be absorbed by the elastic piece firstly, the energy is prevented from being transmitted to other parts, damage to the other parts is prevented, the driving safety is improved, and the maintenance cost after collision is reduced; and meanwhile, through the arranged supporting piece, the stability of the cross beam and the elastic piece is kept under the normal condition, then the cross beam is prevented from shaking in the driving process, the stability of the cross beam is improved, and then the stability of the vehicle structure is improved.