The invention belongs to the technical field of thermal transfer, and discloses high-temperature-resistant thermal transfer paper. The thermal transfer paper is composed of a substrate and a high-temperature-resistant coating which coats the substrate, and the high-temperature-resistant coating is prepared by coating the surface of the substrate by a high-temperature-resistant coating liquid and performing drying; and the high-temperature-resistant coating is prepared from porous starch, modified bentonite, modified diatomaceous earth, polyvinyl alcohol, gas-phase nano silicon dioxide, nano titanium dioxide, fructose, dodecyl dimethyl benzyl ammonium chloride and water, wherein the modified bentonite is prepared from bentonite, a potassium acetate solution, sulfonated cellulose, a silane coupling agent and water, and the modified diatomaceous earth is prepared from diatomaceous earth, sodium lignosulfonate, a silane coupling agent and water. The high-temperature-resistant thermal transfer paper provided by the invention has good high-temperature resistance, and the advantages of good printing quality, a fast drying speed, stable storage and the like; and meanwhile the thermal transfer paper has high thermal transfer efficiency, and a prepared thermal transfer pattern has the advantages of clear and saturated texture, high color fastness and the like.