▎ 摘　　要

NOVELTY - Preparation of composite electrothermal film involves mixing graphene oxide solution, cellulose nano crystal solution with carbon quantum dot solution, stirring, coating, drying to obtain a film, and annealing at high temperature. USE - Preparation of composite electrothermal film. ADVANTAGE - The Preparation of self-supporting graphene-based composite electrothermal film does not require any polymer or metal substrate to be shielded from the substrate, which improves the electrical heating performance of the graphene composite film.