▎ 摘　　要

NOVELTY - The preparation method of diamond powder-graphene composite material involves (1) weighing diamond powder into piranha washing liquid, ultrasonically dispersing, centrifugally washing several times, and ultrasonically dispersing in deionized water to prepare diamond powder dispersing liquid, (2) adding graphene oxide aqueous solution to the diamond powder dispersing liquid, and ultrasonically dispersing to prepare diamond powder-graphene oxide dispersion, (3) dripping sodium borohydride aqueous solution during magnetic stirring of the diamond powder-graphene oxide dispersion, and continuously stirring for 1-3 hours, and (4) centrifugally washing the dispersion liquid several times, and freeze-drying. USE - Preparation method of diamond powder-graphene composite material. ADVANTAGE - The method enables preparation of diamond powder-graphene composite material without impurities on surface of diamond powder, by simple process.