▎ 摘　　要

NOVELTY - The preparation method of graphene film involves (1) adding organic precipitating agent to graphene oxide solution, ultrasonically dispersing, pouring on a mold plate, naturally drying in 50-80% air relative humidity into oxidized graphene film, volatilizing the solvent, removing the remaining solvent under high temperature, (2) reducing the oxidized graphene film processed in step (1) in hydroiodic acid solution, and (3) soaking the reduced graphene film in ethanol, washing off the surface of hydroiodic acid, and naturally drying. USE - Preparation method of graphene film for use as high elastic flexible conductive device. ADVANTAGE - The method enables preparation of graphene film with high horizontal stretching elasticity, excellent flexibility, elastic elongation at break of 20-50 %, and conductivity of 600-1000 S/cm. DETAILED DESCRIPTION - The preparation method of graphene film involves (1) adding 20-100 pts. wt. organic precipitating agent to 100 pts. wt. 1-2 mg/ml graphene oxide solution, ultrasonically dispersing, pouring on a mold plate, naturally drying in 50-80% air relative humidity into oxidized graphene film, volatilizing the solvent to content of more than 90 wt.%, removing the remaining solvent under high temperature at 60-100 degrees C, (2) reducing the oxidized graphene film processed in step (1) in hydroiodic acid solution, and (3) soaking the reduced graphene film in ethanol, washing off the surface of hydroiodic acid, and naturally drying.