The invention discloses anticorrosion sealing wax for bridge cables and anchor heads. The anticorrosion sealing wax is a mixture composed of, by weight, 15-40 parts of microcrystalline wax, 8-30 parts of oxidized polyethylene wax, 10-30 parts of oxidized microcrystalline wax, 3-8 parts of rice bran wax, 10-30 parts of naphthenic oil, 8-20 parts of composite antirust agent, 3-15 parts of thickening agent, 0.5-1 part of dispersing agent, 0.5-3 parts of high temperature resistance oxidizing agent and 0.5-1 part of inorganic filler. According to a preparation method of the anticorrosion sealing wax, all the components are sequentially put in a heating container, a certain temperature is maintained, stirring is performed, and then the anticorrosion sealing wax is prepared. The anticorrosion sealing wax for the bridge cables and anchor heads has the advantages of being high in compactness and sealing performance, low in shrinking rate, high in adhesive force, free of losses, high in dampness and heat resistance, salt mist resistance and oxidation resistance and long in anticorrosion period, and has long-term protective properties on the bridge cables and anchor heads and other steel components.