▎ 摘　　要

NOVELTY - Flexible packaging composite film comprises an outer protective film, an inorganic intermediate film and a flexible bottom film, which are sequentially laminated from top to bottom. The flexible bottom membrane comprises 20-30 pts. wt. diisobutyronitrile ester, 12-16 pts. wt. polyatomic alcohol and 1-3 pts. wt. graphene oxide, where the outer protective film is a polypropylene film. The inorganic material of the inorganic intermediate film includes alumina, silica, zirconia or silicon nitride. The diisobutyronitrile ester includes tetramethylene diisocyanate, hexamethylene diisocyanate, octamethylene diisocyanate or isophorone diisocyanate. USE - The flexible packaging composite film is useful for solar battery backboard film (claimed). ADVANTAGE - The flexible packaging composite film: has high strength, excellent moisture resistance, impact resistance, high hinge property; and is capable of separating water and oxygen. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing the flexible packaging composite film; and (2) use method of flexible packaging composite film.