The invention relates to a corrosion-resistant rod composite material and a preparation method thereof. The rod composite material has the advantages of corrosion resistance, low cost, capacity of bearing higher load and use for corrosion-resistant and heat-resistant working conditions, and mainly comprises a core metal rod and a corrosion-resistant and heat-resistant alloy layer which is arranged at the periphery of the metal rod along the rod length direction, wherein the metal rod and the alloy layer are metallurgically bonded; the cross section area of the core metal rod is 3 to 3,000mm<2>; and the thickness of the alloy layer is 1 to 10mm.