The invention discloses an anti-radar coating for air vehicles and a preparation method of the anti-radar coating. The anti-radar coating is prepared from the following raw materials: polyvinyl acetate emulsion, chlorosulfonated polyethylene, epoxy resin, graphite powder, dihydroxymethyl propane, diethanol amine, chromium sesquioxide, diisocyanate, manganese oxide, indene resin, glass powder, cyclohexanone, n-butyl acetate and pigments. The anti-radar coating has the beneficial effects that a product can resist ultrahigh frequency; high strength radar detection is realized, electromagnetic parameters and frequency are good, and the adhesive force is level 1; the magnetic loss and the dielectric loss are high, the corrosion resistance is good, the temperature stability is good, the storage is easy, the heat conduction coefficient is 0.01W/m.k-0.014W/m.k; the anti-radar coating can resist the temperature of 100-400 DEG C, does not fall and does not corrode metal, and the coating density is 0.1g/cm<3>-0.5g/cm<3>; and the hardness is 2H-6H, and the anti-radar coating is high in electromagnetic radiation absorptivity and infrared reflectivity, simple to synthesize and low in cost, can be widely produced and can be used for continuously replacing the existing materials.