The invention provides a rust-preventing wind power tower barrel. The wind power barrel comprises a barrel body, and is characterized in that a compound material layer is arranged outside the barrel body; a protective layer is arranged outside the compound material layer; the inner side of the barrel body is painted with the protective layer. The compound material is used for replacing part of steel, so that the weight of the wind power tower barrel is reduced and the cost is reduced as the cost of the compound material is lower than that of steel; a polyurethane coating or a fuorocarbon paint coating is sprayed on the outer layer of the compound material; the protective layer can adhere to the compound material well and the adhesion effect of the protective layer is better than that of steel, so that the possibility of looseness and dropping of the protective layer is decreased; the corrosion resistance of the compound material is better than that of steel, and once damaged, the protective layer can be timely repaired under the circumstance that the protective layer is slightly damaged, so that the service life of the wind power tower barrel is prolonged.