The work aims to develop a chitosan/blueberry anthocyanin/titanium dioxide freshness indicator film with good gas sensitivity and stability for rapid and non-destructive detection of meat freshness. The addition ratio of blueberry anthocyanins was adjusted, and the gas sensitivity, physical properties, antioxidant properties and structure of the membrane were systematically evaluated to verify its application in meat freshness monitoring. The results showed that anthocyanins enhanced the gas sensitivity of the membranes, with significant changes in the colour of the membrane gradient in the pH response, and significant changes in the total colour difference in the volatile amine response. For 2% BA membranes, it improved their flexibility (elongation at break 15.6%) and strength (tensile strength 44.27 MPa), as well as solubility (29.67%) and light-blocking (4.30%). The microscopic analyses confirmed that the material intermolecular interactions were stabilized, and titanium dioxide improved the crystallinity and micro-ordering of the membrane. In the application of pork freshness indication effect, the membrane colour difference showed a significant positive correlation with volatile saline nitrogen content (R=0.971 29), which could sensitively reflect the spoilage process. The chitosan/blueberry anthocyanin/titanium dioxide membrane combines excellent stability, sensitive pH/amine responsiveness, and antioxidant capacity, and is capable of monitoring meat freshness in real time through intuitive colour changes, providing an innovative idea for the development of smart packaging materials.