▎ 摘　　要

NOVELTY - Preparing graphene thin film involves treating graphene with ultrasonic wave along with stirring to obtain oxidized graphene, and filtering the impurities. The oxidized graphene is coated with a polyethylene terephthalate (PET) film, and dried continuously to obtain foaming material. The functional group of the oxidized graphite is reduced, gas is released, along with forming air hole and internal cavity when the functional group is decomposed so that the graphene film forms a foam shape. The obtained product is subjected to graphitization to obtain graphene thin film. USE - Method for preparing graphene thin film (claimed). ADVANTAGE - The method enables to prepare graphene thin film with strong shielding effect and good heat dissipation, in a simple way.