▎ 摘　　要

NOVELTY - Preparing graphene powder involves (i) preparing biomass carbon and deionized water into slurry A, grinding the slurry until the fineness is 5-7 µm, (ii) carrying out ultrasonic stripping for 20-30 minutes and microwave stripping of the 260-280 ml graphene aqueous dispersion, sequentially adding the 0.7-0.9 g dopamine in the graphene dispersion, stirring and heating to 80°C, adding reducing agent at 75-95°C, and reacting for 18-22 minutes to obtain compound B; and (iii) soaking the compound B with potassium hydroxide, carbonizing under argon atmosphere, washing with acid, filtering, de-ionized water washing to neutral, and drying. USE - Preparation method of graphene powder used for preparing super capacitor electrode material (claimed). Uses include but are not limited to super capacitor, electrochemical capacitor, electric double layer capacitor, gold capacitor, farad capacitor, and electrochemical element for storing energy by polarizing electrolyte. ADVANTAGE - The graphene powder prepared by the preparation method is not easy to agglomerate, and has good electrochemical capacitance behavior.