The invention provides a wetted wall tower. The wetted wall tower comprises a jacket, a wetted wall column, a liquid distributor, an upper flange, a lower flange and a gas distribution baffle, wherein the jacket is provided with an accommodating cavity; the wetted wall column is provided with a wall part and a hollow part; the upper flange is provided with a gas outlet; the lower flange is provided with a gas inlet, an annular groove and a liquid exhaust opening; the liquid distributor comprises an overflow body with overflow holes and a cap element which forms a liquid receiving cavity and a clearance; en external solution passes through a hollow part of the wetted wall column, the cavity of the overflow body, the liquid receiving cavity and the clearance and flows from top to bottom along the outer surface of the wall part of the wetted wall column so as to form a liquid membrane; an external gas enters from a gas inlet, and the flow direction of the external gas is adjusted by the gas distribution baffle, and the external gas is guided to the accommodating cavity of the jacket so as to be in contact with the liquid membrane in a counterflow mode, so that the gas is absorbed by the solution; the solution flowing from top to bottom along the outer surface of the wall part of the wetted wall column absorbs the gas, and then the gas is accumulated to the annular groove, and is exhausted out via the liquid exhaust opening as a waste liquid; the upward flowing gas containing the absorbed solution acts as exhausted gas, and is exhausted outward via the gas outlet.