Environment-protective packaging film and preparation thereof

An environmental protection packing film of the invention is prepared by konjac glucomannan, carrageenan, glycerine, sucrose fatty acid ester and water; the tensile strength, elongation at break, flexibility and transparency etc. of the invention are superior to like products; and the invention also has advantages of convenient access of materials and low price. The environment protection packing film is non-toxic and does no harm to health even eaten by mistake, thus giving more safety with packing food. Furthermore, transmittance and selectivity are different to different types of gas molecules, selective separation is provided for gases, and oxygen can pass through the film faster than carbon dioxide. The invention is used for packing fruits and vegetables, the proportion of CO2\O2 in the packing bag is gradually increased, which can effectively inhibit respiration of fruits and vegetables and reduce metabolism and senescence.