▎ 摘　　要

NOVELTY - Preparing a graphene involves dissolving cellulose, catalyst and pore former to obtain a mixed solution. The mixed liquid are heated and separated to obtain a solid. The solid is placed into carbonization treatment under vacuum. The catalyst is removed, and the solid is separated, which is the graphene. The catalyst is a soluble iron salt. USE - Method for preparing a graphene. ADVANTAGE - The method is conducive to resource recycling and environmental protection, has simple procedures and low equipment requirements, and is suitable for industrialized large-scale production and application.