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The application discloses a kind of preparation methods of phase change heat insulation automobile paint, belong to coating preparation technical field, including automobile paint, automobile paint includes thermosetting hydroxyl acrylic resin, heat insulation microparticle, coating solvent, diluent, dispersing agent, rheological aid, leveling agent, ultraviolet absorber;The preparation method includes the following steps: S1, the core layer microparticle is prepared by mixing reflective microparticle and phase change material heated to molten state, S2, the oil phase of methyl methacrylate, core layer microparticle, oil phase solvent, initiator, which is mixed with the water phase of deionized water, emulsifier, is made into emulsion, and the heat insulation microparticle is obtained by heating emulsion and reacting, S3, coating solvent, diluent, thermosetting hydroxyl acrylic resin, heat insulation microparticle, dispersing agent, rheological aid, leveling agent, ultraviolet absorber are sequentially mixed and stirred uniformly to obtain automobile paint;The automobile paint of the application can improve the heat insulation effect of automobile and slow down the amplitude of the temperature rise in the automobile.