▎ 摘　　要

NOVELTY - Composite graphene thermally conductive film with a bionic structure, is assembled into layers of nanocellulose, polyethyleneimine, and graphene to form a brick-slurry structure similar to a shell, where composite film comprises 2-90 wt.% graphene, 10-98 wt.% nanocellulose and polyethyleneimine. USE - Composite graphene thermally conductive film. ADVANTAGE - The composite graphene thermally conductive film is easy to industrialization, has stable heat conducting film structure, tensile strength and excellent flexibility. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing composite graphene thermally conductive film, which involves: (A) preparing a nano-cellulose film; (B) assembling the nanocellulose film as the base film layer, and repeating operation to the required number of times so that the layers are assembled in sequence to prepare nanocellulose/polyethyleneimine/graphene oxide Composite film; (C) reducing the composite membrane, repeating the operation as multiple times as necessary, so that the layers are assembled in sequence, and multiple layers of composite nanocellulose/polyethyleneimine/reduced graphene oxide film are produced; (D) heating the film by ultraviolet light or high temperature to obtain a composite graphene thermally conductive film which is composite graphene thermally conductive film having a bionic structure; and (E) separately controlling the layered structure and thickness, and controlling overall structure and thickness of the obtained composite graphene thermally conductive film.