▎ 摘　　要

NOVELTY - Polycrystalline graphene film, where a chemical vapor deposition or physical method is used for releasing carbon atom from a gas (liquid) or a solid carbon source for growing on a catalyst layer for forming the polycrystalline graphene film, is claimed. USE - The film is useful as a flexible transparent conductive film in the organic electroluminescence display, electromechanical storage, organic solar battery and photoelectric functional device. ADVANTAGE - The film is not brittle and has good electrical conductivity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) the preparation of the polycrystalline graphene film, comprising (a) using the chemical vapor deposition method for growing carbon atom in the gas carbon source on the catalyst layer, using a thermal process and fast temperature reducing method for preparing large area polycrystalline graphene film, (b) using the physical method for growing carbon atom in the gas carbon source, liquid carbon source or solid carbon source on the catalyst layer and using the thermal process and fast temperature reducing method for preparing large area polycrystalline graphene film, (c) soaking the catalyst layer in the solution including carbon or coating the organic matter including carbon on the catalyst layer for covering a layer of film including carbon on the catalyst layer, using the thermal process and fast temperature reducing method for preparing large area polycrystalline graphene film, and (d) using an acid for processing the polycrystalline graphene film catalyst layer for removing the catalyst layer after thermal treatment and obtaining a transparent electrode of the polycrystalline graphene film; and (2) the transparent electrode of the polycrystalline graphene film prepared by the above mentioned method, where the parameter is, the light transmittance of the polycrystalline graphene film is 60-98% while the electric conductivity is 1-5000 ohm-2.