A production method for molding includes a. a first molding: depending on a shape to be molded, implementing a die feed-in on soft cloth, with the plastic that is injected in being fused and set with the cloth, for serving as a substrate layer; b. punching and trimming: punching and trimming the plastic that has been set to form a base; c. a second molding: implementing a second die feed-in on the base of a shaped product, with the injected-in plastic being fused and set with a surface of the base, to form the needed shape; d. tailoring and trimming: tailoring and trimming an edge interface between two layers of the assembled plastic to form a shaped product of a double-layer plastic on the soft cloth.