Biodegradable flame-retardant plastic film

The invention discloses a biodegradable flame-retardant plastic film, which is prepared from the following raw materials in parts by weight: 85 parts of polyethylene, 20-30 parts of polylactic acid, 65-80 parts of a PBM degradable material, 10-15 parts of packing, 5-10 parts of pullulan, 2-4 parts of an antioxidant, 1-1.5 parts of an ultraviolet light absorber and 25-30 parts of nano flame-retardant composites. The oxygen-isolating biodegradable plastic film disclosed by the invention is prepared by blending extrusion and film blowing of mature modified starch biodegradable plastic master batches PBM and pullulan and film-grade LDPE in the market at present in the preparation method; good mechanical property of the film is ensured by using the characteristics of the LDPE; the environment friendliness of the film material is achieved by using the biodegradability of the PBM and the pullulan; the oxygen isolating property of the film material is improved by using high oxygen isolating property of the pullulan; the overall compatibility of the plastic film material is improved by using the structure similarity of starch and the pullulan as carbohydrates; and regulation and control of the oxygen isolating property, the biodegradability and the like can be achieved by controlling the blending ratio of the LDPE / PBM / Pullulan system.