The invention relates to an automobile bumper energy absorption box with stable performance, which is used for solving the problems easily generated in the collision process of the energy absorption box made of steel materials. The energy absorption box consists of an energy absorption post and an energy absorption device, wherein both the energy absorption post and the energy absorption device are in a round platform-shaped funnel type, the small opening end of the energy absorption post is inserted into the small opening end of the energy absorption device, and the energy absorption post is welded with the energy absorption device. Through changing the structural design of the energy absorption box, the stability of the energy absorption box during the collision pressing crushing is greatly improved on the premise that the collision performance meets the requirement, simultaneously, the structure is simple, and the weight is reduced through being compared with that of the common energy absorption box. The cross section of the energy absorption box is in a round structure, so the diameter can be freely changed according to the design space of a bumper, and the structural deformation energy absorption mode is not influenced. The design possibility of different material thicknesses is provided for design personnel through the screwing pressing technology, and the energy absorption requirements of different automobile types can be met.