▎ 摘　　要

NOVELTY - Preparation of graphene involves: 1) mixing lignin with water and reacting with 60-70 wt.% nitric acid, filtering, separating black solid phase; 2) dispersing the black solid phase in water, to obtain dispersion liquid, hydro-thermally treating the dispersion liquid at 170- 200°C, filtering, removing liquid phase to obtain water-soluble graphene; 3) subjecting water-soluble graphene to dialysis treatment and drying. USE - Method is used for preparing graphene. ADVANTAGE - The method is a simple process which enables preparing graphene in high yield.