A manufacturing method for a golf club head includes the steps of: prefabricating a main-body wax pattern and a striking-plate wax pattern, the main-body wax pattern providing with a rear opening and the striking-plate wax pattern providing with a stepped portion; initially combining the main-body wax pattern with the striking-plate wax pattern that remains an adhesive-filling groove between the rear opening of the main-body wax pattern and the stepped portion of the striking-plate wax pattern; filling adhesive into the adhesive-filling groove to constitute a combination member of the main-body wax pattern and the striking-plate wax pattern; immersing the combination member in slurry to form a ceramic shell and heating the ceramic shell for lost-wax processing; and pouring a melting alloy into the ceramic shell to form a club head casting.