Vacuum stainless steel single cone rotary crystallizer is a kind of crystallization equipment which combines the advantages of vacuum technology and stainless steel. The working principle is that the material solution is cooled and crystallized by pumping vacuum. During the operation, the raw material solution is preheated by a heater outside the unit and injected into the crystallizer. After entering the vacuum environment, the solution quickly has a flash effect, the steam is quickly withdrawn, and the solution begins to cool and crystallize. This process not only improves the heat transfer efficiency, but also ensures the stability of the operating environment.