The falling film concentrator feed liquid is added from the top of the concentrator, and descends along the wall of the tube under the action of gravity, and evaporates and concentrates in the process, and a concentrated liquid is obtained at the bottom. The falling film concentrator can concentrate materials with a higher concentration and a higher viscosity (for example, in the range of 0.05 to 0.45 Ns/m 2 ). The concentrating equipment is widely used in the evaporation and concentration of water or organic solvent solutions in the pharmaceutical, food, chemical, light industry and other industries, and can be widely used in the waste liquid treatment of the above industries. Especially suitable for heat sensitive materials, the equipment is continuously operated under vacuum and low temperature conditions, with high evaporation capacity, energy saving, low operating cost, and can ensure the material is invariable during evaporation. Falling film concentration is to add the liquid to the upper tube of the heating chamber of the falling film concentrator, and distribute it evenly into the falling film concentrator of each heat exchange tube through the liquid distribution and film forming device. Under the action of gravity and vacuum induction and air flow, It flows into the uniform film from top to bottom. During the flow, it is heated and vaporized by the shell-side heating medium, and the generated steam and the liquid phase enter the separation chamber of the evaporator. The vapor-liquid is sufficiently separated, and the steam enters the condenser for condensation (single-effect operation) or enters the next-effect evaporator. The medium is heated to achieve multi-effect operation, and the liquid phase is discharged from the separation chamber. The main body of the equipment consists of I, II, III effect heaters, separators, heat pump, condenser, sterilizer, insulation pipe, material pump, water pump and instrument cabinet. This equipment is made of high quality stainless steel when in contact with materials.