The invention discloses a pouring method for a reinforced concrete protective layer of an iron tower foundation. The pouring method comprises the following steps: firstly building a reinforced structure at a position where the iron tower foundation is prebuilt; welding two supporting ribs with length of 5 cm on the two sides or two ends of each edge of rectangular stirrups in the horizontal direction respectively, wherein the supporting ribs are perpendicular to a corresponding edge of each rectangular stirrup, and the space between upper and lower groups of adjacent supporting ribs is 100-150 mm; fixedly arranging four formworks on the outer side of the rectangular stirrups and bundling together to form a closed pouring space, wherein the inner surface of each formwork is abutted against the corresponding supporting rib; pouring concrete in the pouring space defined by the formworks by using a concrete pouring vehicle, and closing the top end with an upper cover after the pouring space is filled up; disassembling the formworks after three days, wrapping with plastic cloth and placing in a pit for curing to finish operation. The method can guarantee that the thickness of protective layer of the reinforced concrete is uniform and reaches 5 cm to prevent oxidation of the reinforcements and prolong the life cycle of the iron tower foundation.