The invention discloses a quick-drying high-temperature-resistant undercoat for steel. The undercoat comprises the following component in percentage by weight: 26-28% of bisphenol F-type liquid epoxy resin, 6.5-6.8% of iron oxide red powder, 11-13% of titanium dioxide, 8-10% of a defoamer, 5.5-5.8% of a fire retardant, 3.2-3.8% of mica, 8-12% of a multifunctional additive AMP-95, 12.2-12.5% of graphite powder, and the balance of watercraft acrylic resin. According to the preparation method for the quick-drying high-temperature-resistant undercoat used for the steel, the undercoat is dried quickly, has no peculiar smell, and is good in adhesive property, stable to alkaline and most solvents, good in corrosion resistance, gas resistance, inflaming retarding, water resistance, thermal insulation and the like , and excellent in friction resistance and high temperature resistance.