▎ 摘　　要

NOVELTY - A graphene thin film is prepared by coating graphene oxide acid solution on a magnesium thin film, drying the deposited graphene oxide, and then dissolving the magnesium thin film using dilute acid to obtain graphene film. USE - Method of preparing graphene thin film (claimed). ADVANTAGE - The method has simple technique and low cost, is green and environment-friendly and suitable for large scale preparation of graphene thin film.