Anthocyanins, as natural substances existing in plants, are not only non-toxic to human body, but also have good antioxidant properties. Anthocyanin was extracted by solvent extraction and ultrasonic-assisted extraction, and anthocyanin composite film was prepared by blending anthocyanin solution with film-forming matrix. The thickness, water content, water solubility, oxidation resistance, pH color rendering and infrared absorption spectrum of the composite film were measured. The average thickness of the composite film was 0.0387 mm, the water content was 22.78%, while the water solubility was 31.55%, the water vapor permeability was 6.2359×10-4 g·mm·Pa-1·h-1·m-2. 1,1-diphenyl-2-trinitrophenylhydrazine (DPPH) resistance was equivalent to 15.84 times that of 1 mL 0.02 mol/L standard vitamin E solution, and had good color rendering effect in different pH buffer solutions. The anthocyanin indicator film prepared by experiment has similar appearance and physical properties similar to the ordinary plastic wrap, and it can spontaneously degrade in water and has excellent anti-DPPH free radical ability, which has a good application prospect in food packaging.