▎ 摘　　要

NOVELTY - Preparing magnetic composite film material doped with silicon-based heteropoly acid comprises (i) adding metal salt A, metal salt B and graphene oxide into solvent C, stirring at normal temperature, adding silicon-based heteropoly acid, and continuously stirring uniformly to obtain mixed solution; (ii) dissolving alkali in the prepared mixed solution, and performing solvent thermal reaction, and (iii) filtering the product obtained by solvent thermal reaction, washing with ethanol and water and drying. USE - The method is useful for preparing magnetic composite film material doped with silicon-based heteropoly acid. ADVANTAGE - The method is simple and environmentally friendly.