NOVELTY - An external packing forming material of polymer lithium ion battery core, comprises external resistance layer, barrier layer and a barrier layer laminated body composed of the multilayer co-extrusion complex film layer, where the external resistance layer is a polymer film composed of at least two film base of e.g. polypropylene, chlorinated or casting polypropylene, polyethylene naphthalate, high transparent packaging film or two composite is composed of at least a layer of heat resistant resin film, where the barrier layer of aluminum foil contains iron (0.9-1.5 wt.%).    USE - As external packing forming material used in polymer lithium ion battery core (claimed), in mobile phone, palm computer, portable computer, portable military tool, portable camera, DVD player, electric bicycle, motorcycle and car, and electric wheelchair.    ADVANTAGE - The external packing forming material has super barrier property, good cold impact molding resistance, puncture resistance, and electrolyte stability; and can resist organic solvent and volatile matter battery package molding material.    DETAILED DESCRIPTION - An external packing forming material of polymer lithium ion battery core, comprises external resistance layer, barrier layer and a barrier layer laminated body is composed of the multilayer co-extrusion complex film layer, where the external resistance layer is a polymer film composed of at least two film base of polypropylene (PP), chlorinated polypropylene or casting polypropylene (CPP), polyethylene (PE), poly-p-phthalic acid glycol ester (PET), nylon (PA) or aromatic nylon (MXD6), MPE elastomer blend, polyvinylidene chloride (PVDC), ethylene-vinyl alcohol copolymer (EVOH), polyethylene naphthalate (PEN), high transparent packaging film (GT) or two composite is composed of at least a layer of heat resistant resin film, and PEN, or a mixture of two of co-extrusion compound together, where the barrier layer of the aluminum foil at least containing Fe (0.9-1.5 wt.%), where the high barrier laminated body includes substrate, a function layer and heat sealing layer, the base layer, high-barrier is uniformly coated with a waterproof modified polyvinyl alcohol (PVA) film on the polymer film substrate.