1. A method for directly replicating a plastic rubber mold with a human body as a matrix is characterized by comprising the following steps: (1), preparing paraffin with a freezing point of 4O-5O; (2) keep the paraffin above freezing point, and keep it in the tolerable temperature range of human body surface for later use; (3) laying a mold opening line on the body surface of the molded human body according to the mold opening trajectory; (4) evenly smearing the paraffin reserved in the step (2) on the body surface of the molded human body, wherein the thickness of the wax layer is 2-3mm, and naturally cooling the mold threads; (5) After cooling and shaping on the preset mold opening trajectory, the mold opening line is pulled to cut off the wax layer, and each module is taken down; (6) All modules assembled according to the original pattern are sealed with hot wax to form a complete mold.