The invention discloses an aircraft anti-radar stealth coating and a preparation method thereof, wherein the coating comprises the raw materials: hydroxyl acrylic resin, butadiene-acrylonitrile rubber, a polypropylene emulsion, acetone, sodium hexametaphosphate, absolute ethyl alcohol, polyether modified silicone oil, an acrylonitrile-butadiene-styrene copolymer, paraffin, coumarone resin, zinc oxide, chromium oxide, calcium oxide and a dispersant. The coating resists ultrahigh-frequency and high-intensity radar detection, has the advantages of good electromagnetic parameters and high electromagnetic radiation absorption rate, and has the coating layer density of 0.15-0.35 g / cm<3>; the electric conductive coefficient is 0.01-0.014 W / m*k, the infrared reflectivity is high, and a coating film is hard and glossy; the surface drying time is 10-30 min at the temperature of 25 DEG C, the actual drying time is 1-4 h at the temperature of 25 DEG C, and the coating film is flat and smooth, is resistant to humidity, air, acid rain, sea water and salt fog corrosion, and has the hardness of 2-6 H; the coating is resistant to high and low temperatures, is resistant to low temperature of -60 DEGC and high temperature of 400-600 DEG C, and has the level 1 adhesion power.