The shell - and - tube UHT sterilizer consists of a control cabinet, as well as a material tank, a heat exchanger, and a cooler connected to the control cabinet. The material outlet of the material tank is connected to the material pipe inlet of the heat exchanger. The material pipe outlet of the heat exchanger is connected to the material pipe inlet of the cooler, and the material pipe outlet of the cooler is connected to the material inlet of the material tank. The inner tube of the heat exchanger is a corrugated tube.

In the shell - and - tube UHT sterilizer of this utility model, by changing the inner tube of the heat exchanger into a corrugated tube, there are no contact points inside the tube. As a result, the product will not adhere to the tube, and coking is less likely to occur. Meanwhile, there is a high - level turbulence inside the corrugated tube, which has a self - cleaning effect during the product flow process. Compared with the straight - tube heat exchanger, it has much lower pollution and scaling, longer operation time, and better cleaning effect.