A manufacturing method for a hybrid one-piece design of a wax pattern of a golf club head includes the steps of: prefabricating a first wax pattern in a first molding assembly, the first wax pattern having a connecting portion; inserting the first wax pattern into a first mold cavity of a second molding assembly which has a configuration substantially corresponding to that of a first component of the golf club head; filling liquid wax into a second mold cavity of the second molding assembly which has a configuration substantially corresponding to that of a second component of the golf club head; and cooling the liquid wax in the second mold cavity to form a second wax pattern joined to the connecting portion of the first wax pattern.