<p>Disclosed is a simply-structured cyclonic classifying device capable of arbitrarily changing the classification point. The disclosed classifying device is provided with: a cyclone body comprising a cylindrical straight body portion having the top end closed by a planar top plate and the bottom end open, and a narrowing portion continuous with the bottom end of said straight body portion and gradually narrowing in diameter towards the bottom; a port member disposed in the top region of the straight body portion for introducing an injection material and particulates internally; and a concentrically-arranged cylindrical suction member passing through the aforementioned top plate. The disclosed cyclonic classifying device is also provided with a classification adjuster capable of internally controlling the classification point.</p>
