Chitosan was mixed with carrageenan and tea polyphenols, and chitosan-carrageenan composite film was prepared by the fluidized bed method and its properties were tested. The light transmittance, mechanical property and water resistance of the composite film were investigated by single factor test, and then the response surface experiment was carried out to optimize the preparation process of the composite film with water vapor transmittance as the evaluation index. The results showed that the optimal process of chitosan - carrageenan edible composite film was as follows: adding 1.5% of chitosan, 0.4% of carrageenan, 0.6% of glycerol, 0.6% of tea polyphenols, and drying temperature of 50 ℃. Under this condition, the thickness of the composite film was uniform and the mechanical properties were good. The water vapor transmission rate was 1.37 (10–11 g/m·s·Pa).