The invention discloses a casting method of an iron mold used for the sand-coated iron mold casting technique. The casting method of the iron mold used for the sand-coated iron mold casting techniquemainly comprises the steps that an iron mold cavity core prepared from core sand obtained by mixing phenolic resin with furan resin is used, and a planar core sand flat plate is arranged when the upper plane of the iron core is formed; a lower sand mold body and an upper sand mold body of the iron mold are manufactured; the upper sand mold body and the lower sand mold body of the iron mold are assembled and placed in a sprue cup so as to be cast; and mold opening is conducted after cooling, and thus the iron mold is prepared. According to the casting method of the iron mold used for the sand-coated iron mold casting technique, the good cast appearance of the iron mold is ensured, and it is ensured that a sand coating is uniform and consistent when an iron mold cavity is in use.