The work aims to develop a new gelatin-based freshness indicator label to solve the problems of poor stability of aqueous solution and natural pigment migration of gelatin-based freshness indicator film, and explore the gain effect of the addition of dialdehyde-based cellulose on the stability of the indicator film and the freshness indication performance of the composite indicator film. The PSPA/DAC/GE composite films were prepared with gelatin (GE) as the film-forming matrix, dialdehyde cellulose (DAC) as the cross-linking agent, and purple sweet potato anthocyanins (PSPA) as the pH-sensitive pigment to indicate the freshness of chicken. Experimental results such as infrared spectroscopy (FT-IR) and aqueous solution stability test showed that the addition of DAC could effectively reduce the swelling and solubility of the composite film, and could better load PSPA. PSPA/DAC/GE was used to monitor the chicken freshness and the composite film showed good response to ammonia generated during the deterioration of chicken, and the color development effect of the indicator film was most obvious when the PSPA content was 10% of the dry weight of GE. This shows that the PSPA/DAC/GE composite film can be successfully used for chicken freshness monitoring and freshness visualization, thereby effectively reducing the risk of consumers coming into contact with spoiled food and providing producers and consumers with a more convenient way of production and consumption.