The invention relates to a high vacuum distillation purification device which comprises a falling film evaporator, a gas-liquid separator, a U-shaped tube heater, a U-shaped tube condenser, a material circulating pump, a liquid-accepting tank, a cold trap, and a vacuum pump unit, and is characterized in that the gas-liquid separator is directly connected to the falling film evaporator and the U-shaped tube condenser, and the U-shaped tube heater is disposed at the bottom of the gas-liquid separator. The beneficial effect of the device of the invention is that: the adoption of a directly-connected compact structure, a large-diameter heating tube of the falling film evaporator, and a built-in condenser reduces the airflow resistance inside the device, decreases the air capacity leaked by the device, and guarantees the realization of a high vacuum degree; the material is evaporated by a falling film, which has the advantages of high heat transfer efficiency, great processing capacity, difficult scaling, and the like; situations such as thermal polymerization or thermal decomposition are effectively reduces, and the device has the advantages of high product yield and quality; the device has certain energy saving effect; in addition, the device has a simple structure, low cost, and flexible operation, and is applicable to both continuous operation and intermittent operation.