The invention discloses a corrosion-resistant material-coated iron-based composite ground rod and a preparation method thereof. The ground rod comprises a steel core (1), an intermediate layer (2) and a coating layer (3), which are sequentially arranged, wherein the coating layer (3) is arranged on the outer surface; the intermediate layer (2) is arranged on the surface of the steel core (1) in a cold drawing, electroplating or horizontal continuous casting manner; and the coating layer (3) coats the outer surface of the intermediate layer (2) in a cold drawing or spraying manner. According to the ground rod disclosed by the invention, the problems of susceptibility to corrosion of steel and pollution of copper are solved; and the corrosion-resistant material-coated iron-based composite ground rod has good conductivity, excellent corrosion resistance and environmental protection properties.