The utility model relates to an arrange thick liquid wet flue gas desulfurization device, belong to flue gas purification equipment technical field. Technical scheme is: flue gas entry (3) is established at absorption tower (2) lower extreme, and establish in absorption tower (2) upper end exhanst gas outlet (5), sprays layer (4) and establishes position on the inside of absorption tower (2), and the entry that sprays layer (4) passes through circulating pump (7) and thick liquid pond (8) intercommunication, and the bottom of absorption tower (2) is equipped with slurry drain, and the entry that slurry drain passes through pressure valve (11) and hydrocyclone (9) communicates, hydrocyclone (9) inside circular cone type cavity that is equipped with, the upper end of liquid separator (9) is equipped with first export (91) that communicate with thick liquid pond (8), and the lower extreme of liquid separator (9) is equipped with the second export (92) that communicates with gypsum sunning pond (10). The beneficial effects of the utility model are that: the mixed thick liquid of gypsum in the effectual discharge reaction tower accessible time to separate the mixed thick liquid of exhaust and recycle, reduced the desulfurization cost.