▎ 摘　　要

NOVELTY - Preparing powder type graphene oxide comprises taking graphite powder and sodium nitrate, taking concentrated sulfuric acid in an ice bath and reacting under stirring condition, slowly adding potassium permanganate and mixing heating, carrying out primary oxidation, adding warm water and hydrogen peroxide, carrying out secondary oxidation, adding 1+9 hydrochloric acid (HCl) to remove the un-reacted oxide, centrifuging and washing to neutral pH to obtain golden syrup type material, carrying out freeze-drying to obtain sponge layer solid oxide, and grinding to obtain powder type graphene oxide. USE - The method is useful for preparing powder type graphene oxide (claimed). ADVANTAGE - The method: is simple and produces powder type graphene oxide which is easy to weigh and store.