The utility model discloses a gypsum rain integrated device is prevented to wet flue gas desulfurization system condensation defogging, including entry flue, a type heat pipe restraint, dirt wastewater collecting device, desulfurizing tower entry flue, desulfurizing tower, desulfurizing tower exhaust pass, type B heat pipe restraint, condensation drainage device, middle flue, scale removal nozzleand exhaust pass. Between A type heat pipe shu weiyu entry flue and the exhaust pass, its heat absorbing end lies in the entry flue, and heat releasing end lies in exhaust pass, between type B heat pipe shu weiyu desulfurizing tower exhaust pass and the middle flue, its heat absorbing end lies in desulfurizing tower exhaust pass, flue in the middle of heat releasing end lies in. A type heat pipe is restrainted and the scale removal nozzle is installed on type B heat pipe bundle heat absorbing end top, dirt wastewater collecting device is installed to the bottom that A type heat pipe was restrainted, condensation drainage device is installed to the bottom that the type B heat pipe was restrainted, and its internally mounted has the stirring unit. The utility model discloses the system is with low costs, and the desulfurization is efficient, prevents the scale deposit, and easy the washing has effectively prevented gypsum rain's production.