▎ 摘　　要

NOVELTY - Preparing lignite-based graphene involves using strong base and weak acid salt to extract lignite from different producing areas after centrifugal separation and hydrothermal carbonization reaction of the liquid phase product, and then drying and grinding the hydrothermal carbonized solution to obtain an activated precursor. The activated precursor is activated in nitrogen atmosphere for 1 hour to obtain a porous carbon material. The activated porous carbon material is pickled, washed with water, and dried to obtain lignite-based graphene. USE - Method for preparing lignite-based graphene used for preparing lignite-based graphene energy storage electrode (claimed). ADVANTAGE - The method enables to prepare lignite-based graphene in a cost-effective manner, where the lignite-based graphene is beneficial to the industrial production of the material.