Intelligent indicating film capable of monitoring pickle fermentation process in real time

The invention discloses an intelligent indicating film capable of monitoring a pickle fermentation process in real time, which is prepared by the following steps: adding a Romassa coffee skin extract of which the anthocyanin content is not less than 20g/100g into a chitosan-glycerol matrix to prepare a film-forming solution, drying the film-forming solution, and cutting, when in use, the intelligent indication film is placed in a pickle jar, and is attached to the interior of a pickle jar cover to be in full contact with gas in the pickle jar; the contents of lactic acid, acetic acid and the like generated by reproduction and fermentation of anaerobic lactic acid bacteria in the fermentation process of vegetables are changed, so that the color of the indicating film is correspondingly changed; the intelligent indicating film disclosed by the invention adopts a natural anthocyanin extract, is rich in color change, high in safety and simple in manufacturing process, and is beneficial to real-time monitoring of