The invention relates to the technical field of paints, in particular to heat-resistant paint and a preparation method thereof. The heat-resistant paint is prepared from the following components in parts by mass: 8-12 parts of tung oil, 3-5 parts of quartz powder, 1-3 parts of aluminum phosphate, 4-9 parts of polyarylsulfone resin, 4-9 parts of polyimide resin, 5-7 parts of butanol, 3-7 parts of nonisocyanate polyurethane, 2-4 parts of china clay, 2-4 parts of talcum powder, 5-8 parts of cobalt iso-octoate, 0.2-1.2 parts of an anti-settling agent, 8-18 parts of a curing agent and 2-6 parts of an anti-cracking agent. The heat-resistant paint has the benefits that 1 the heat-resistant paint prepared by mixing the tung oil, the polyarylsulfone resin, the polyimide resin, the butanol, the nonisocyanate polyurethane, the talcum powder and the cobalt iso-octoate is good in heat-resistant effect, and has excellent physical and chemical properties such as the decorative property, the heat resistance, the salt fog resistance, the salt water resistance, the water resistance, the cold tolerance, the oil resistivity, the hydrocarbon solvent resistance, the adhesive force, the impact strength and the flexibility.