▎ 摘　　要

NOVELTY - The preparation method of composite film involves ultrasonically dispersing graphene oxide dispersion liquid in nano-rice hull fiber dispersion liquid and then filtering, heating the filtrate and then carbonizing, enzymatically hydrolyzing gelatin dispersion liquid using endopeptidase, adding 3-5 pts. wt. terephthalaldehyde and then adjusting pH value, heating the mixture and then stirring, concentrating the mixture and drying. USE - The method is useful for preparation of composite film. ADVANTAGE - The method enables preparation of composite film with excellent mechanical property.