The utility model discloses an abrasion-resistant impeller device of a medium-speed coal mill. The abrasion-resistant impeller device comprises an impeller body and an impeller fixing plate which is used for fixing the impeller body, wherein the impeller body comprises a fan-shaped inner ring plate, a fan-shaped outer ring plate and a plurality of flow-guiding steel plates arranged between the fan-shaped inner ring plate and the fan-shaped outer ring plate; two sides of each flow-guiding steel plate are respectively and correspondingly welded on the fan-shaped inner ring plate and the fan-shaped outer ring plate; an annular fan-shaped body for air throttling is arranged at the upper part of each flow-guiding steel plate; an adjustable hood is fixed on the fan-shaped outer ring plate through a bolt assembly; a kidney slot used for adjusting the adjustable hood is formed in the fan-shaped outer ring plate; an abrasion-resistant protecting plate is arranged on the impeller fixing plate and mounted on the outer ring of the impeller fixing plate. According to the abrasion-resistant impeller device, the service life of the medium-speed coal mill can be prolonged by more than ten times; the maintenance quantity of the medium-speed coal mill is reduced; the hidden danger of the medium-speed coal mill is eliminated; the safe reliability of the medium-speed coal mill is increased. Thus, the stable operation of powder preparing production is ensured. In addition, the abrasion-resistant impeller device is small in investment and convenient to assemble and use.