This equipment is suitable for pharmaceutical, biological, food, chemical and other industries. It is mainly used for terminal treatment of saline wastewater. It is a common equipment in environmental protection system. According to the characteristics of high salinity and high concentration of chemical organic wastewater, based on the principle of evaporation, concentration and crystallization, multi effect vacuum evaporation is adopted to concentrate and crystallize organic wastewater. After the salt in the concentrate is separated, it is recovered through the salt collector, and the concentrate is dried, recovered or incinerated. The evaporated condensate is generally treated through subsequent biochemical treatment, which can realize the standard of wastewater discharge.