The invention relates to a chemical coating material with resistance to geothermal water corrosion and a preparation method of the chemical coating material, and belongs to the technical field of newenergy materials. Nano zirconium dioxide is added to a coating solution, so that a three-dimensional network skeleton is formed between Ni-P particles and ZrO2 nanoparticles, the Ni-P particles are filled with the ZrO2 nanoparticles, a coating is subjected to crystallization and Ni and P desolventizing decomposition under the action of heat treatment, P atoms diffuse and are subjected to lattice distortion, and Ni and intermetallic compounds are formed. Meanwhile, the electrode potential of Ni is higher than the electrode potential of Cu, a uniform film is formed on the surface of the coating,and the passivation film can effectively block the corrosion process and can also significantly reduce porosity of the coating grain refinement coating, effectively inhibit contact between a corrosion medium and a substrate, and improve corrosion resistance. Phosphate has the function of a buffer agent and promotes adsorption of a salt film protective layer to form a uniform film layer, oxalic acid can activate the surface of the steel substrate, borax can retard corrosion of the coating from the external environment, and corrosion resistance of the coating is enhanced.