The utility model provides an acid mist fan shaft end sealing device, including quiet ring, rotating ring, spring, bearing seal, end cover, casing axle sleeve and leaf wheel shaft sleeve during constitutes, the impeller of leaf wheel shaft sleeve, rotating ring and acid mist fan in proper order the suit at the tip of fan drive axle, the tight cover of casing axle sleeve is epaxial at fan drive, quiet ring sliding sleeve is in casing axle sleeve outside and pass through spline and fan casing sliding connection, and quiet ring is hugged closely with the adjacent terminal surface of rotating ring, the end cover is fixed on the casing of fan, spring pine cover in the epaxial and compression of fan drive between end cover and quiet ring, the bearing seal tightly overlaps presses on the fan casing on quiet ring and by the end cover. The utility model discloses the pretightning force of utilizing the spring to provide makes rotating ring and quiet ring in close contact with, forms effective mechanical seal, utilizes the bearing seal to stop the acid mist to overflow the fan casing, can prevent effectively not only that the acid mist from corroding the fan drive axle, guarantees the steadyoperation of acid mist system, but also has eliminated the acid mist outer accident potential that leads to the fact of arranging in time.