▎ 摘　　要

NOVELTY - A graphene film is prepared by providing graphene thin film grown on substrate; spin-coating polyvinyl alcohol acetal glue on surface of the film; suspending the whole thin film in etching solution such that the substrate is completely cleaned to form a self-supporting flexible plastic graphene film. USE - Method for preparing graphene film (claimed). ADVANTAGE - The method has simple operation, is convenient and fast, has low cost, and can ensure that the graphene thin film has high quality. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for transferring graphene.