The invention discloses an anti-scald wax rim fixer special for prosthodontics. The anti-scald wax rim fixer comprises an outer shell with hollow interior and two opening ends; a cheek retractor is arranged on the exterior of the shell; the cheek retractor is connected with the shell; a piston is arranged in the shell; the piston is capable of moving in the shell along the axis direction of the shell; a heating head is fixed at the bottom of the piston; the heating head extends out of the shell; an elastic resetting device is sleeved on an outer wall of the heating head; the elastic resettingdevice is arranged in the shell and is located under the piston. According to the invention, a wax spatula is heated to 75 DEG C under constant temperature, so that the wax rim is prevented from excessively melting under ultrahigh temperature, scalding the patient by the flowing liquid wax or generating wax smoke; the cheek retractor is arranged on the periphery of the heating part and is capableof pulling the lips and preventing the lips from scalding; the heating part is arranged in a temperature-insulating pipe; the heating head can stretch out after the heating part is pressed; the heating part can be pressed and fixed after the stable heating position is accurately located; the sliding operation is not required, so that the scald caused by improper operation of the doctor or the lipmotion of the patient can be avoided.