The invention relates to a moulding die which is used for an internal circular surface of a pressurizing stator sheet, and comprises a moulding die body, wherein the moulding die body is provided with a containing cavity for containing the stator sheet and a cone for pressurizing the internal circular surface of the stator sheet in the containing cavity; and the containing cavity and the cone areseparately arranged. The moulding die has the advantages that the structure is simple; and the binding degree of the stator sheet as well as the circular degree and perpendicularity of the iron core of a motor are greatly enhanced.