▎ 摘　　要

NOVELTY - Preparing biomass three-dimensional porous graphene comprises (a) drying the biomass material, crushing to obtain biomass powder, (b) grinding and mixing the biomass powder and water-soluble inorganic salt at a mass ratio of 1:4-10 evenly, conducting a high-temperature pyrolysis reaction in an inert gas atmosphere, cooling to room temperature and (c) washing away the inorganic salt template with hot water at 90-100 degrees C, recovering the molten salt through filtration and washing and drying the obtained black solid product is dried to obtain biomass three-dimensional graphene. USE - The graphene is useful for preparing super capacitor, sensor, catalytic, fuel cell, adsorbent and lithium air battery field (claimed). ADVANTAGE - The method: is simple and easy to implement; shortens the three-dimensional graphene preparation cycle; is environmentally friendly than the redox method for preparing graphene and has short high-temperature cracking time. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a biomass three-dimensional porous graphene prepared by the above method.