The invention provides a propeller molding structure and belongs to the field of molding technology. The propeller molding structure comprises an integral lower mold, upper molds A of which the numberis the same as that of blades, and upper molds B of which the number is the same as that of the blades. The external suction surfaces of the upper molds A are positioned between the leading edge parting surfaces and the following edge parting surfaces of the upper molds A, and are positioned above the pressure surfaces of the lower molds after being matched; and the leading edge parting surfacesof the upper molds A are matched with the leading edge parting surface of the lower mold after being assembled, the following edge parting surfaces of the upper molds A are matched with the followingedge parting surface of the lower mold after being assembled, and the following edge side walls of the upper molds A are perpendicular to the following edge parting surfaces and are matched with the following edge side wall of the pressure surface of the lower mold after being assembled. Partial blade root suction surfaces starting from leading edges in the upper molds B are matched with adjacentpartial blade root suction surfaces starting from following edges after being assembled so as to form internal suction surfaces; and internal leading edge parting surfaces are matched with the leadingedge parting surfaces after being assembled. The propeller molding structure provided by the invention can reduce the modeling difficulty of overlapping areas of blade roots, increase the molding thickness of propeller blade roots, enhance the molding strength of blade roots, as well as reduce the mold assembly difficulty of propeller molding.