▎ 摘　　要

NOVELTY - Graphene conductive ink comprises graphene, cellulose substance and solvent, where the solvent is chosen from low boiling point solvents, preferably a solvent with a boiling point of 30-100 degrees C, such as methanol, ethanol, isopropanol, ethyl acetate and/or water, and the cellulosic substance is chosen from non-ionic cellulosic substances, preferably ethyl cellulose, methyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, hydroxymethyl cellulose, and/or nitrocellulose. USE - The graphene conductive ink is used in printing for preparing graphene conductive film and graphene in electronic device, preferably flexible electronic device (all claimed). ADVANTAGE - The method does not need to be oxidized and has high electrical conductivity, and is simple in process and suitable for continuously large scale production. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing graphene conductive ink, which involves (i) adding graphite powder to a mixed solution of cellulose substances/solvent, and performing homogeneous emulsification pretreatment on the mixed solution to obtain a graphite dispersion, (ii) using a high-pressure microjet method to mechanically peel off the graphite dispersion to obtain a graphene dispersion, and (iii) centrifuging the graphene dispersion liquid to remove larger and incompletely peeled sheets to obtain an upper layer dispersion liquid which is the graphene conductive ink; (2) a graphene conductive film comprising a substrate and a graphene conductive layer on the substrate, where the graphene conductive layer is prepared from the graphene conductive ink, and the graphene conductive layer is a graphene conductive layer obtained by annealing and mechanical compression; and (3) a method for preparing the graphene conductive film, which involves (i) coating the graphene conductive ink on a substrate, and drying until the solvent is completely volatilized to obtain a graphene conductive layer, and (ii) sequentially performing annealing and mechanical compression treatment on the graphene conductive layer to obtain the graphene conductive film, where the annealing is carried out at 200-500 degrees C for 10-90 minutes, and the mechanical compression treatment is carried out at 5-30 MPa for 1-20 minutes.