Vacuum concentration tank

The utility model discloses a vacuum concentration tank, and relates to the technical field of concentration tanks, the vacuum concentration tank comprises a tank body and a cover body, the tank body is internally provided with a main stirring shaft, a driven stirring shaft, a wall scraping assembly, a stirring piece and a connecting assembly, and the main stirring shaft is used for stirring raw materials and cleaning impurities adhered to the inner wall of the tank body; the main stirring shaft vertically penetrates through the cover body and is fixedly connected to an output shaft of the driving part, the main stirring shaft and the tank body are coaxially arranged, and the rotating directions of the main stirring shaft and the driven stirring shaft are opposite; a driving part used for driving the main stirring shaft to rotate around the axis of the main stirring shaft is arranged at the top of the tank body, and a heating assembly used for heating the tank body is arranged on the peripheral wall of the ta