▎ 摘　　要

NOVELTY - Preparing manganese dioxide/graphene nanocomposite involves mixing mesoporous carbon with potassium permanganate and deionized water with stirring for 8-24 hours to obtain suspension which is mixed with concentrated sulfuric acid with stirring for 0.5-3 hours to obtain a mixture. The mixture is heated to 70-90 degrees C for 0.5-3 hours to obtain the reaction solution. The reaction solution is diluted with deionized water, cooled to room temperature and precipitated. The resulting solution is filtered to obtain precipitate which is washed and dried to obtain manganese dioxide/graphene nanocomposite. USE - Method for preparing manganese dioxide/graphene nanocomposite which is used as modified electrode used for detecting caffeic acid in beverages, food and medicine (claimed). ADVANTAGE - The method enables to prepare manganese dioxide/graphene nanocomposite which has good stability and high sensitivity. The electrode prepared using manganese dioxide/graphene nanocomposite has low detection limit and strong anti-interference performance.