The invention relates to the technical field of coatings, in particular to a high temperature-resistant fireproof coating and a preparation method thereof. The high temperature-resistant fireproof coating is prepared from the following raw materials in parts by weight: acrylic resin, inorganic filler, a thickener, a flame-retardant agent, a ceramic additive, fireproof short fibers, a crosslinkingagent, a coupling agent, a flatting agent, a defoaming agent, a wetting agent, a film forming additive, other additives and solvents. The high temperature-resistant fireproof coating has the advantages that high temperature can be endured, the flame-retardant property is good, the propagation of fire condition is well blocked, and the fireproof property is excellent; the effect of resisting long-time impact by 1100 DEG C hydrocarbon high-temperature fire hazard is realized; the weather-resistant property and waterproof property are realized, the shrinkage is avoided, the coating strength is high, and the surface is flat.