Mobile Phone Display Rack,Mobile Phone Stand Display,Point Of Sale Mobile Display Rack,Smartphone Metal Display Stand Dongguan Display Leader Co., Ltd , https://www.ddlretaildisplay.com The present invention relates to a biodegradable multilayer film with adjustable barrier effects on oxygen, nitrogen, carbon dioxide and water vapor for use in the packaging field, in particular for food packaging and in agriculture, and a Its preparation method. Also given is a multilayer film obtained by co-extrusion which consists of at least one layer of a starch mixture consisting of a modified thermoplastic starch mixture containing 1-10% water, and which is biodegradable. The layer formed by the polyester is formed.