The invention discloses orange red powder coating taking modified composite pigment yellow as a raw material and relates to the technical field of coating. Aiming at disadvantages of an existing organic pigment, a manner combining inorganic core coating and surfactant treatment is adopted and is used for carrying out compound modification on organic pigment. The orange red powder coating disclosedby the invention takes ferric hydroxide colloid with positive charges as an inorganic core, and organic pigment molecules are adsorbed at the periphery of the inorganic core very well by utilizing attraction of positive and negative charges and high-adsorption performance of the surface of the colloid, so that first-time modification is realized. Then the ferric hydroxide colloid is transformed into transparent iron yellow alpha-FeOOH through a catalyst PdCl2 and second-time modification of the organic pigment is realized under the action of disodium methylenedinaphthalenesulfonate and sodiumdodecyl sulfate.