The equipment adopts the combination of external heating natural circulation and vacuum negative pressure evaporation. The evaporation speed is fast, and the concentration ratio can reach 1.3. The liquid material is fully sealed without foaming and concentration. The liquid medicine concentrated by this equipment has no pollution and medicinal taste. It is thick and easy to clean (open the upper and lower covers of the heater to clean). This equipment is easy to operate and occupies a small area. The heater and evaporator adopt stainless steel heat preservation structure, and the outer heat preservation layer is made of stainless steel sheet, and the surface is treated with mirror or matt finish. The recovery capacity is large, and the vacuum concentration process is adopted. Compared with the old-type similar equipment, the productivity is increased by 5-10 times, the energy consumption is reduced by 30%, and it has the characteristics of small investment and high recovery efficiency.