Preparation method of antibacterial and antioxidant food fresh-keeping film

The invention discloses a preparation method of an antibacterial and antioxidant food fresh-keeping film. The method comprises the following steps that 1, oil-tea meal is extracted and filtered by an ethanol solution at the temperature of 80-95 DEG C to obtain an extraction solution; 2, the extraction solution is decolored, a solvent is evaporated to concentrate the extraction solution, and an oil-tea meal extract is obtained; 3, edible gelatine and the oil-tea meal extract are dissolved in water to obtain a water solution, Pulullan is dissolved in lactic acid to obtain a lactic acid solution, and the water solution and the lactic acid solution are mixed and emulsified to obtain a film solution, wherein in the film solution, the concentration of the oil-tea meal extract is 10-20wt%, the concentration of the edible gelatine is 0.3-0.8wt%, the concentration of the lactic acid is 1-2wt%, and the concentration of the Pulullan is 1-2wt%; 4, the film solution obtained in the step 3 is homogenized and refined, and then degassing, tape casting, drying and film uncovering are performed on the film solution, so that the food fresh-keeping film is obtained. The fresh-keeping film can utilize oil-tea meal and also has the antibacterial and antioxidant performance.