▎ 摘　　要

NOVELTY - Preparing manganese dioxide/graphite oxide (MnO2/GO) composite material comprises using waste liquid of oxidized graphene as raw material, filtering, adjusting pH of filtrate to 4-10 by adding alkaline substance, adding potassium permanganate, reacting for a certain period of time, precipitating, and filtering. USE - The method is useful for preparing MnO2/GO composite material by using oxidized graphene, where the composite material is useful in super capacitor research. ADVANTAGE - The method is simple and easy to operate, cost-effective, consumes less energy, shortens the time consumption, and provides nano-grade MnO2/GO composite material with good capacitor performance.