■The bird's nest high-temperature sterilization retort uses indirect heating and cooling methods, which effectively avoids direct contact between the sterilization process water and the cooling water, significantly reduces the risk of secondary contamination of food, and improves the cleanliness of the product. It can accurately control the multi-stage heating and cooling process to ensure the uniformity of the sterilization effect of each batch of products, and the thermal distribution error is controlled within ±0.5°C. At the same time, a small amount of sterilization process water can be quickly circulated to achieve rapid heating, sterilization and cooling of the product, thereby effectively saving energy.