▎ 摘　　要

NOVELTY - Preparing graphene film by batch comprises (i) taking graphene oxide film as raw material, and subjecting it to low-temperature heating for pretreatment to obtain low-temperature pretreated graphene oxide film, (ii) carrying out rolling treatment of the low-temperature pretreated graphene oxide film, and performing medium-temperature heating treatment to obtain medium-temperature treated reduced graphene oxide film, (iii) carrying out rolling treatment of the medium -temperature-treated reduced graphene oxide film, and performing high-temperature heating treatment to obtain high-temperature-treated reduced graphene oxide film, and (iv) rolling the reduced graphene oxide film under high temperature treatment to obtain final product. USE - The method is useful for preparing graphene film by batch. ADVANTAGE - The method: is simple; reduces the residual oxygen-containing group in the graphene film; improves graphene film performance; reduces the graphene film interlayer gap; and improves the graphene film surface flatness. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for graphene film prepared by above method.