▎ 摘　　要

NOVELTY - The preparation method of graphene material involves (1) heating lignocellulose and catalyst at 15-25 degrees C, stirring at 150-300 rpm for 30-60 minutes, (2) filtering the step (1) mixture, drying at 110-135 degrees C, obtaining graphene precursor, (3) heating graphene precursor at 1100-1450 degrees C, stirring at 10-60 rpm, passing carbon dioxide and nitrogen as protective gas, obtaining graphene primary product, (4) heating at 15-25 degrees C and pulverizing. USE - Preparation of graphene material used for super-capacitor and lithium ion battery. ADVANTAGE - The method enables preparation of graphene material by simple, environmentally-friendly and economical process.