▎ 摘　　要

NOVELTY - Method for preparing biomass-based high-thermal-conductivity flexible composite film, involves (a) dissolving silk protein in solvent to obtain silk protein solution, adding heat-conducting filler to silk protein solution, and uniformly mixing to obtain heat-conducting filler/silk protein dispersion liquid, (b) using aluminum foil as receiving electrode by electrostatic spinning method, and spinning heat-conducting filler/silk protein dispersion liquid to obtain heat-conducting filler/silk protein composite fiber membrane, (c) adding receiving electrode loaded with heat-conducting filler/silk protein composite fiber membrane to reinforcing liquid for impregnation, peeling the heat-conducting filler/silk protein composite fiber membrane from receiving electrode to obtain self-supporting heat-conducting filler/silk protein composite fiber membrane, and (d) laminating self-supporting heat-conducting filler/silk protein composite fiber membrane, and heating to form composite film. USE - Composite film used as thermal management material for flexible electronics and wearable electronic devices. ADVANTAGE - The composite film has high thermal conductivity and excellent flexibility, adopts silk protein as base material, and silk protein as biomass material, which degraded under natural conditions, and is environmentally-friendly.