▎ 摘　　要

NOVELTY - The preparation method of nano iron(II,III) oxide/graphene composite material involves (1) dissolving trivalent iron salt, divalent iron salt and urea in water to obtain mixed solution (1), (2) adding reduced graphene oxide to water, ultrasonically dispersing, stirring, and uniformly dispersing graphene suspension to obtain mixed solution (2), (3) uniformly mixing the mixed solution (1) and solution (2) to obtain mixed solution (3), and reacting the mixed solution (3) at 120-180 degrees C for 3-5 hours, and (4) cooling the product, washing using ethyl alcohol solution, and drying. USE - Preparation of nano iron(II,III) oxide/graphene composite material (claimed) for use as multifunctional nano material, biomedical material, electromagnetic shielding material, electrode material, and catalytic material, and for sewage treatment. ADVANTAGE - The method enables preparation of nano iron(II,III) oxide/graphene composite material by simple process.