Injection molding die for bumper

The utility model discloses an injection molding die for a bumper, which comprises a die base, a mold core, an ejector retainer plate, an ejector retainer plate resetting device and forced ejection mechanisms, wherein the forced ejection mechanisms are arranged at both sides of the mold core. Each forced ejection mechanism comprises a forced ejection sliding block and a driving device. The driving devices are used for driving the corresponding forced ejection sliding blocks. The forced ejection sliding blocks are matched with the mold core to form a forming surface of a flanging of the bumper. After the bumper is formed, the forced ejection sliding blocks are driven by the driving devices to move outwards; the flanging of the bumper is driven by the forced ejection sliding blocks to move outwards, so that the local demoulding of the bumper and the mold core is completed; and then the ejector retainer plate is driven by an external driving device to eject outwards, so that the completed demoulding of the bumper is realized. Therefore, the die not only can ensure the bumper to be demoulded successfully, is simple integrally and is simple, rapid and convenient to assemble, disassemble and maintain, the time is saved, and the working efficiency is improved.