▎ 摘　　要

NOVELTY - Method for preparing graphene film, involves adding graphite oxide or expansible graphite to a heating furnace, heating the graphite to 700-1500 degrees C, maintaining the temperature for 0.5-30 minutes, naturally cooling the mixture to obtain flocculent graphite, obtaining certain amount of flocculent graphite, pulverizing the graphite using a mill into powder, transforming the powder into a beaker containing liquid, maintaining the mixture, agitating the mixture or processing the mixture ultrasonically, and maintaining the mixture to form graphene film on liquid level. USE - The method is useful for preparing graphene film used as raw material for filming. ADVANTAGE - The graphene has excellent reduction effect. The film has excellent conduction performance and transparent performance, and can be prepared by the action of graphene and surface tension of the liquid.