▎ 摘　　要

NOVELTY - Preparation of flexible graphene film comprises chemically reducing graphene oxide film, placing between two infinite flat plates for confinement, and heat treating. USE - The method is used for preparing flexible graphene film for preparing electromagnetic shielding material for flexible devices, portable electronic products, or wearable devices (claimed). ADVANTAGE - The film has controllable porous structure and/or dense structure, uniform thickness, excellent flexibility, high temperature resistance, and excellent electromagnetic shielding performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation device comprising two opposite flat plates provided with a space containing the graphene film.