The invention discloses a method for preparing anti-ultraviolet and anti-aging food flexible packages. The method has the advantages that composite nanometer sol with anti-ultraviolet capability is prepared from optimal nanometer oxide, after-treatment processes are carried out after coating treatment is carried out on food flexible package finished products, the coating stable performance of thecomposite nanometer sol further can be improved, migration and dissolution can be prevented in the consideration of the high stability of the sol, accordingly, the anti-ultraviolet and anti-aging foodflexible packages can be prepared by the aid of the method, are excellent in anti-aging capacity and difficult to migrate or dissolve out and are safe and stable, and the health safety performance ofthe anti-ultraviolet and anti-aging food flexible packages can be improved.