▎ 摘　　要

NOVELTY - The preparation method of graphene involves weighing graphite as raw material and then carrying out Friedel-Crafts reaction, grafting using maleic anhydride functional group and ultrasonically processing. USE - The method is useful for preparation of graphene. ADVANTAGE - The method enables simple, easy and economical preparation of graphene with high yield and efficiency and excellent electrical conductivity in environmentally-friendly manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for graphene prepared by the method.