▎ 摘　　要

NOVELTY - Preparing graphene oxide comprises (i) adding graphite, acid and oxidant into mixing tank and mixing at low temperatures, (ii) feeding the mixture obtained in step (i) into first piping reactor and reacting at certain temperature for 1-4 hours, (iii) adding solvent and a reducing agent into the reaction mixture obtained in step (ii), then feeding into a second conduit reactor and reacting at certain temperature for 1-50 hours, and (iv) post-treating the reaction mixture of step (iii) to obtain final product. USE - The method is useful for preparing graphene oxide (claimed). ADVANTAGE - The graphene oxide has higher oxidation degree, and is suitable for industrial production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for device for preparing graphene oxide comprising a mixing tank, a first piping reactor, a second conduit reactor, mixers, condensers and post-treatment systems, the output end of mixing tank and the input end of the first pipe reactor are connected through a first conduit, the first conduit is provided with a fourth metering pump, the output end of first conduit reactor being connected to the input end of the mixer through a second conduit, the output end of the mixer is connected with the input end of the second pipe reactor through the third conduit, the output end of second pipe reactor is connected with the input end of the condenser through the fourth conduit, and output of the condenser is connected to the post-processing system.