The device includes concentration tank、condensator、gas-liquid separator、cooler and liquid receiving barrel. The concentrator tank is of clip sleeve structure. The condensator is of line pipe type and the cooler is of tray pipe type. The device is suitable to concentrate in the pharmacy、foodstuff and chemistry and simple reflux extraction. The fact that the part in contact with the material is made with stainless steel brings qualified anti-corrosion performance, meeting with the GMP standard.