The present invention relates to an apparatus for, in a multi-stage dryer for drying coal using reheat steam, minimizing occurrence of dust and dispersedly supplying coal to a transfer device when coal is supplied to the multi-stage dryer from a fixed quantity coal supplier by way of a pulverizer. The present invention relates to an apparatus for drying coal using reheat steam, the apparatus being configured so that coal which has been dried primarily in a first coal dryer is inputted into a second coal dryer and thus is secondarily dried. The apparatus comprises a fixed quantity coal supplier for supplying a fixed amount of coal onto the surface heading for the top of a first transfer plate, and comprises a dust reducer consisting of: an inlet pipe coupled by a bearing to a discharge port of the fixed quantity coal supplier; a worm wheel coupled to the outer circumferential surface of the inlet pipe; a worm which is coupled by a gear to the worm wheel and which rotates by a rotator power delivered from a mot
