The invention discloses an injection moulding method for a thermoplastic rubber mold. The method comprises the following steps of injecting a rigid substrate material and an elastic lamination material, then dipping a mold in specially used vegetable oil for 24-28h, and after finishing dipping, heating the mold at 250-350 DEG C for 10-20min; arranging quenching and tempering treatment according tothe texture characteristics of the injection mold; controlling the quenching temperature at 1,000-1,100 DEG C, preserving heat for 30-40min, cooling by adopting a level-to-level cooling manner, tempering by adopting medium-temperature tempering, keeping the temperature at 380-400 DEG C, preserving heat in a salt bath furnace for 1.5-2.5h, and then air cooling to room temperature to obtain the thermoplastic rubber mold. According to the injection moulding method for the thermoplastic rubber mold, the volume shrinkage and sink mark index are effectively reduced, thereby further guaranteeing thequality of injection moulded products.