The invention discloses a scrubbing tower for gas containing sublimable substances. The scrubbing tower is composed of an upper part and a lower part, the upper part is a scrubbing liquid buffering chamber, and the lower part is a scrubbing liquid separating chamber. The upper part and the lower part are separated through a partition plate. Three pipe orifices are formed in the upper part, the scrubbing liquid inlet is formed in the middle, U-type pipe connector is formed in the bottom, an upper connector of a balance pipe is formed in the top of the tower, by means of the balance pipe, gas (liquid foam with flashing) of the upper part is introduced to the lower part to be separated, and pressure balance between the upper part and the lower part of the seal tower is kept. A sublimable substance scrubbing and separating chamber is formed in the lower part and sequentially comprises an in-tower connector for the gas containing the sublimable substances, an in-tower connector for gas phase in a scrubbing liquid storage tank, a lower connector for the balance pipe, a filler layer for enabling the gas and liquid to make tight contact for mass transfer and scrubbing, a lower U-type pipe connector, a foam removal net and a purified gas outlet pipeline from bottom to top. The scrubbing tower is simple in structure and ingenious in concept and has the good functions of resisting gas phase liquid foam entrainment and resisting blocking by the sublimable substances.