The present invention discloses a propeller casting molding method comprising the following steps: making a propeller steel mold; making a sand core; assembling for forming a propeller sand core; making a pouring gate steel mold; making a mud core; and making a sand box; and the manufacturing process comprises casting; picking up; sawing a riser, and grinding for molding. The propeller casting molding method is strong in operability and good in technology, and can improve propeller quality, increase production efficiency and reduce production costs, product quality meets customer demand for products, and a new profit growth point is created for enterprises.