▎ 摘　　要

NOVELTY - The method involves stacking multiple single-layer graphene oxide films. Heat insulation treatment is performed. Heat management process is performed by using a torchlight for reduction to make single-layer graphene oxide film self-maintaining chain reduction. USE - Method for preparing of graphene film with low cost and large area. ADVANTAGE - The method enables preparing graphene film with low cost and large area by managing the heat generated in the photothermal reduction process without additional energy input, thus realizing large scale of preparing the graphene film. The method ensures that the obtained reduced graphene oxide film exhibits a higher quality in electrical conductivity and porosity. DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart illustrating the Method for preparing of graphene film with low cost and large area (Drawing includes non-English language text).