Multi layer co extrusion barrier film is generally produced using a multi-layer co extrusion blow molding process or casting process as a film forming technology. Multi layer co extrusion has excellent barrier performance, mechanical properties, tensile forming performance, and heat sealing performance, and does not require additional compounding during the processing, nor does it involve printing ink, adhesive, and additive residue. Therefore, it is a relatively green, environmentally friendly, and cost-effective food packaging technology process.