The invention relates to a method for coating a powdery material with a high polymer material. The coating method adopts purely physical coating. Coating of solid powder by using the coating method enables the solid powder to have other properties while maintaining original characteristics unchanged, so the usage performance of the solid powder is improved. The method overcomes the problem of influence on the performance of the solid powder due to characteristics of the solid powder. In treatment of the powdery material, the method has the advantages of short treatment time, high coating efficiency, low price and easy availability of raw materials and safety.