The embodiment of the invention provides a reflective heat-insulation coating and a preparation method thereof. The reflective heat-insulation coating comprises the following raw materials of aqueous pure crylic acid resin, aqueous elastic resin, titanium dioxide, ceramic hollow microspheres, infrared powder, a flame retardant, water, an organic dispersant, a film-forming additive, an antifreeze, a thickener, an anti-foaming agent, a wetting agent, a preservative and a pH value regulator. The coating is a single-component aqueous coating, has no toxicity and good weatherability; extremely fine hollow microsheres are closely arranged by multi-stage in the coating to form a vacuum layer so as to have extremely strong reflection and obstruction function to the solar radiation heat and can effectively reduce the radiation heat transfer and convection heat transfer, thus reducing the heat balance temperature on the surface of the article. The reflective heat-insulation coating leads the building space and the facility container to be warm in winter and cool in summer, reduces the heat island effect and energy consumption of the air conditioner, has obvious energy-saving effect, and reduces the surface temperature by 20 DEG C to a maximum extent and reduces the internal temperature by 5-10 DEG C compared to the normal coating.