A composite plastic mold for compression molding, extrusion, injection molding, blow molding and low foaming molding, which mainly comprises a concave die composed of a concave die combination substrate, a concave module piece and a concave die combination card plate, which consists of a convex die combination substrate, a convex module, a punch combination card plate, A convex die with a variant core consisting of a cavity truncation assembly and a side-cut composite plate. Coordinate changes of die convex, concave die and auxiliary molding system. Can be processed in different shapes, different sizes of the series of plastic parts. The plastics processing industry is equipped with plastic forming machines to give plastic products complete configurations and precise size tools. Because of the variety of plastic and processing methods, plastic molding machine and plastic products structure and simplified, so the type and structure of plastic molds are also diverse.