The present invention relates to an air dedusting device which prevents the formation of a dead zone on a selective catalytic reduction (SCR) panel by rolling a pipe or the restacking of a part of dust floated by air spray in an overlapping position. The air dedusting device comprises: a valve which is installed on an outer portion of an SCR panel, and introduces air from the outside; an air supplying pipe through which the air is introduced with its one end connected to the valve, and which is installed on an upper portion of the SCR panel; a plurality of blowing nozzles which are connected to a lower side of the air supplying pipe in the longitudinal direction; and a rolling means which rolls the air supplying pipe.
