Novel environment-friendly heat insulating coating and preparation method thereof

The invention relates to a novel environment-friendly heat insulating coating and a preparation method thereof. The novel environment-friendly heat insulating coating comprises the following components in percentage by weight: 10 to 50 percent of film forming matter, 1 to 3 percent of expanded vermiculite, 5 to 25 percent of meerschaum, 1 to 20 percent of hollow microspheres, 0.5 to 5 percent of wetting agent, 0.5 to 5 percent of dispersing agent, 0.5 to 5 percent of defoaming agent, 0.5 to 5 percent of silane coupling agent, 1 to 10 percent of auxiliary agents, and 10 to 50 percent of solvent. The preparation method comprises the following steps of: grinding, vacuum filtrating, drying, grinding, screening and drying the expanded vermiculite, and then evenly mixing the dried expanded vermiculite with the dried meerschaum and the hollow microspheres to form a component A; mixing the film forming matter, the solvent, the wetting agent, the dispersing agent, the defoaming agent, the silane coupling agent and other auxiliary agents to obtain a component B; and evenly mixing the components A and B, and defoaming the mixture to obtain the heat insulating coating of the invention. The prepared insulating coating is coated on the surface of a working surface, is cured at the normal temperature and completely dried to achieve the effects of heat preservation and heat insulation.