The utility model discloses a desulfurization wastewater discharge system, including the spray column, gypsum swirler, vacuum belt hydroextractor and effluent disposal system, spray column thick liquid export with gypsum swirler entry is connected through the fluid -discharge tube, be provided with the gypsum excavating pump on the fluid -discharge tube, gypsum swirler overflow mouth passes through back the liquid union coupling with the spray column entry, it is provided with first buffer tank on the liquid pipe to return, gypsum swirler underflow opening passes through gypsum thick liquid pipe to be connected with vacuum belt hydroextractor, its characterized in that, vacuum belt hydroextractor filtrate (liquid passes through the filtrate pipe and is connected with effluent disposal system. Still be provided with waste water swirler and preformed precipitate pond on the filtrate pipe. The utility model discloses filtrating is got to the direct vacuum belt hydroextractor of following, regards as the waste water source after handle in waste water swirler, preformed precipitate pond, changes prior art regards as the waste water source with the overflow of gypsum swirler scheme. The treatment effect of waste water suspended solid solid content is very effective, and the handling capacity all is superior to design standard with emission quality of water. This scheme implementation simple and practical has and promotes and the practicality.