▎ 摘　　要

NOVELTY - Method for preparing composite material, involves (a) coating an organic layer on the surface of a powder filler to obtain a powder having a core-shell structure, (b) adding the obtained powder to a graphene slurry, stirring for 0.1-10 hours, filtering and drying to obtain a solid mixture, where the amount of graphene in graphene slurry is 0.005-20 wt.%, and (c) adding the obtained solid mixture to vacuum or inert atmosphere, calcining at 300-1200 degrees C for 0.5-24 hours, cooling and crushing to obtain the composite material. USE - The method is used for preparing composite material (claimed). ADVANTAGE - The composite material has excellent electrical and thermal conductivity, and is prepared by simple process, economical and easy for large-scale production and application.