▎ 摘　　要

NOVELTY - Method for preparing graphene oxide coating film, involves adding graphene oxide (1 mg) to water (1 ml), ultrasonically treating and stirring the mixture to obtain colloid suspension of graphene oxide at 20-45 degrees C, coating the colloid suspension of graphene oxide to surface of universal film by spraying or rolling, drying and forming graphene oxide film, coating the oxide for several layers, forming film when the top layer of graphene oxide is dried, covering the universal film on the top layer of graphene oxide and obtaining the graphene oxide coating film. USE - The method is useful for preparing graphene oxide coating film which is used in food and medicine packaging. ADVANTAGE - The graphene oxide coating film has excellent transparency and separation performance, is environmentally-friendly and hence highly safe, and improves separation performance upon carbon dioxide.