The invention relates to a sealing device of a dryer, in particular to a sealing device applied on the end of a dryer tumble. The sealing device comprises a tumble support ring; the side surface of the tumble support ring is evenly provided with a wear resistant elastic part; the end of the tumble is arranged on the tumble support ring; the end face of the tumble is axially extruded on the wear resistant elastic part. The wear resistant elastic part comprises a wear resistant felt layer and an elastic felt layer. Because of the structure, the sealing device on the end of the dryer tumble can seal evenly; in addition, in the device, a wear resistant double-layered sealing strip is adopted, so that the sealing device on the end of the tumble can automatically compensate the wear of the tumble to the sealing strip, and the sealing does not become uneven because of longer working time; the device has better sealing effect to the end of the dryer tumble.