Food spoilage detection film wherein, the food spoilage detection film with nano-protrusions is flexible and elastic and can alter light paths to produce a structural color, which changes under external force, indicating food spoilage

The present invention provides a food spoilage detection film, which mainly includes a film body and multiple nano-protrusions located on one side of the film body, wherein the film body has the characteristics of flexibility and elasticity. These nano-protrusions are used to alter the path of a light beam, so that the film body produces a structural color. When the film body receives an external force, it undergoes a deformation with a change in curvature that affects the angle at which the light beam contacts the nano-protrusions, which in turn will cause the structural color of the body to deform in relation to the structural color of the body that has not deformed. Accordingly, the change in the structural color of the film body can be used to determine whether the food is in a spoiled state.