▎ 摘　　要

NOVELTY - Preparing graphene comprises taking semi-permeable coating graphite anode, graphite cathode, placing in the acid electrolyte, carrying out electrolysis, taking the graphite anode form the first oxidation, the size of the graphene is larger than the first oxidation, continuing electrolysis, splitting into the second oxidation, the size is smaller than the second graphene semi-permeable membrane aperture, through the semipermeable membrane, collecting the acid electrolyte in the second oxidized graphene and reducing to obtain the product. USE - The method is useful for preparing graphene (claimed).