The invention discloses a white smoke elimination system for blast furnace slag flushing dead steam, and belongs to the technical field of white smoke elimination of blast furnace slag flushing dead steam. The white smoke elimination system comprises a slag trough, a granulation tower, a granulation tower outlet water pipeline, a stirring cage, a stirring cage sealing cover, a dead steam pipeline, a stirring cage outlet water pipeline, a cooling tower, a slag flushing water supply pump, a slag flushing water supply pipeline, an environment-friendly condensation, dehumidification and white smoke elimination device, a condensate water collecting pipeline, a condensate water tank, a condensate water pressure pump and a condensate water conveying pipeline. The system has the advantage that the problems that the blast furnace slag flushing dead steam generation amount is large, the dead steam emission moisture content is large, corrosion and white smoke plume caused by chimney rain pollute the environment, and water resources are wasted are solved.