▎ 摘　　要

NOVELTY - Composite film comprises acetic acid, chitosan, tea polyphenols, low concentration graphene oxide, glycerol and crosslinking agent, where the concentration of graphene oxide is 0.1-0.5 %mass. USE - The composite film is useful in food packaging applications. ADVANTAGE - The composite film adopts graphene oxide uniformly dispersed on composite film, is prepared by simple process that is convenient to operation, and has excellent mechanical and barrier properties. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the composite film, involving (a) preparing acetic acid solution for dissolving chitosan, where the concentration of acetic acid solution is 96.3-96.8 %mass, (b) adding graphene oxide, glycerol, crosslinking agent, tea polyphenol and chitosan to acetic acid solution, and uniformly stirring, (c) performing ultrasonic dispersion treatment to obtain film-forming liquid, (d) spreading film-forming liquid on glass plate to form composite film with certain thickness, and (e) drying glass plate in oven to obtain required composite film.