Ultrasonic negative-pressure circular extracting equipment

The utility model provides ultrasonic negative-pressure circular extracting equipment, which can be used for extracting active components from a natural product. The ultrasonic negative-pressure circular extracting equipment mainly comprises a backflow evaporator, an ultrasonic generator, a vacuum pump, a low-temperature cooling circulating pump, an infusion pump, an extracting bottle and a collecting bottle. The vacuum pump can enable the inside of the backflow evaporator to be at a negative pressure state, so that the collecting bottle connected with the backflow evaporator is kept at the negative pressure state, and a collected extracting solution is good for evaporating and concentrating in the evaporator by using a solvent. The low-temperature refrigerant circulating pump keeps the evaporator at a low temperature, so that solvent steam evaporated in the evaporator is efficiently condensed and back-flown to the extracting bottle connected with the evaporator. The infusion pump can continuously convey a ma