Roundness vacuum concentration tanks consisting of main body, condensator, gas-liquid separator and liquid receiving barrel, serves to concentrate, distil the material liquid and rediam organic menstruum in the pharmacy, foodstuff and chemistry. The concentration under reduced pressure brings short time of concentration and prevents the destruction of the effective content in the thermal sensitive material. 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.