The invention provides a heat-dissipation paint for iron casting surfaces, relating to the technical field of heat-dissipation paints. The invention is characterized in that the heat-dissipation paint is composed of the following components in parts by weight: 30 parts of water-soluble epoxy resin, 5 parts of kyanite powder, 3 parts of silica sol, 4 parts of zircon flour, 3 parts of aluminum oxide, 5 parts of calcined potash feldspar, 2 parts of xylitol, 2 parts of calcined kaolin, 3 parts of barite powder, 5 parts of large-granule graphite, 50 parts of deionized water 2 parts of hexatitanium crystal whisker, 2 parts of flake graphite, 2 parts of zirconia, 5 parts of modifier, 2 parts of nano anion powder, 2 parts of silicon nitride, 2 parts of chromite powder, 2 parts of boric acid water solution, 1 part of nano titanium dioxide, 2 parts of polyester polyol and 2 parts of slaked lime powder. By adding the modifier into the traditional formula to perform modification treatment, the coated heat-dissipation paint can effectively achieve the effects of radiation and heat dissipation, has the advantages of low cost, low harm to the human body, high coating strength, no crack, no blister, uniform coating and high surface quality.