Wet flue gas desulphurization dedusting tower and wet flue gas desulphurization dedusting method

The invention provides a wet flue gas desulphurization dedusting tower. The tower comprises a tower body, a spraying layer (1) and a demister layer (2) which is above the spaying layer. The tower is characterized in that: a bubbling system (3) special for wet flue gas desulphurization dedusting is arranged above the demister layer (2), wherein the bubbling system (3) special for wet flue gas desulphurization dedusting comprises several flue gas pipes (31) which are combined parallally, bubbling pipes (32) which are arranged between the flue gas pipes or on the pipe walls, and wetting liquid absorption and conveying subsystems (33); liquid steam bubble discharging apparatuses (321) are arranged on the bubbling pipes (32) and are used for discharging liquid steam bubbles to the flue gas pipes (31), and the lower ends or the upper ends of the bubbling pipes (32) are connected with the wetting liquid absorption and conveying subsystems (33). In the flue gas pipes (31), rising flue gas and dense steam bubbles are merged and blended, so that flue gas and steam bubbles are in full contact, a small amount of residual SO2 in the flue gas is absorbed, at the same time ultrafine particles in the flue gas are absorbed or wetted, so that the ultrafine particles either enter liquid, or agglomerate into droplets as a result of wetting, and separation becomes easier. The invention also relates to a wet flue gas desulphurization dedusting method by using the technology.