The utility model discloses a bionical rear?bumper of heavy -duty car to it does not get well and makes the compact car pierce the problem of front truck vehicle bottom easily to overcome the energy -absorbing nature of current heavy car?bumper common material, including an insurance regulations and parameters body, its insurance regulations and parameters body is by last inclined plane, the inclined plane semicircle cambered surface different with two radiuses on lower inclined plane constitutes with connecting upward on the inclined plane down, fixed mounting has two undersettings on the last inclined plane of the insurance regulations and parameters body, two undersettings are articulated with the lower extreme of two buffer beams in proper order, the upper end of two buffer beams is articulated with two upper brackets in proper order, the back frame upper portion at the heavy -duty car is all fixed to two upper brackets, two buffer blocks are the round platform shape, the small diameter 's of the insurance regulations and parameters body semicircle cambered surface through two connecting blocks in proper order with the last bottom surface fixed connection of two buffer blocks, the back frame lower part at the heavy -duty car is all fixed to the lower bottom surface of two buffer blocks, the utility model discloses simple structure, with low costs, the energy -absorbing is effectual, easy to use and popularization.