Time-temperature indicator and preparation method thereof

The invention belongs to the technical field of cold storage and refrigeration, and particularly relates to a time-temperature indicator and a preparation method thereof. The time-temperature indictor comprises an indicator fixing plate and a sealing thin film, wherein a fixing clamping slot is formed in the other end of the indicator fixing plate, the end part of one end of the fixing clamping slot is close to a thin film liquid storage bag, a diffusion medium belt matched with the fixing clamping slot in length is fixed in the fixing clamping slot, a thorn sheet is embedded in one end, close to the thin film liquid storage bag, of the diffusion medium belt, and scale marks are marked on the front side of the indicator fixing plate. The time-temperature indicator can reflect the change of the quality of a frozen food and indicate the remaining shelf life of the frozen food, and the critical temperature is freely regulated within the scope of 0-12 DEG C, so that the scope of application of the indicator is gr