The invention relates to a preparation method of a complex polysaccharide edible film, which comprises the following steps: by using konjak glucomannan and other plant polysaccharides as raw materials, adding a plasticizer, physically mixing, running to form a film, and drying to obtain the edible film. The polysaccharide complex edible film prepared by the method has the advantages of high smoothness, favorable light transmittance and favorable mechanical properties; the tensile strength is 10-120 Mpa, the light transmittance is 20-90%, the oxygen permeability is 10-100 cm<3>/m<2>.24h.0.1MPa, and the water vapor permeability is 500-2000 g/m<2>.24h; and the edible film can be used for packaging solid powder or low-water-activity food, and has wide application prospects.