▎ 摘　　要

NOVELTY - Method for electrochemically preparing manganese dioxide-graphene composite involves (i) dissolving soluble salts containing ammonium, sulfate, persulfate or halogen anions and soluble salts containing permanganate or manganate in deionized water to form electrolyte, (ii) placing double graphite electrodes in the electrolyte and connecting it to a square wave voltage, and completing the reaction, and washing the reacted electrolyte several times and drying to obtain the light yellow powder. USE - The method is used for controlling preparation of inorganic nano materials. ADVANTAGE - The method reduces the use of precious metal electrodes and cost, is implemented simply in a general beaker or glassware, is environmentally-friendly, simple in equipment, short in operation time, convenient in operation, simple in process and easy to scale up.