The invention discloses a manufacturing method for a high polymer material three-dimensional product. According to the method, a blank of the three-dimensional product is obtained through an additive manufacturing method or a mold forming method firstly, and the base materials of the blank comprise mixed high polymer materials and conductive materials. Secondly, the blank is put in an electromagnetic environment, the blank is heated until the high polymer materials are fused through an electromagnetic induction method, and the high polymer materials are fused and soak the other materials in the blank. Afterwards, the materials are slowly cooled to the room temperature, and therefore the three-dimensional product of which the shape is the same as that of the blank and the mechanical performance mainly depends on the high polymer materials is formed.