The invention relates to a husking-roll driving device of rice hulling machine. A husking-roll driving device where are provided a first belt-clutch mechanism switching power transmission to a first large-diameter pulley, and, at the same time, a second belt clutch mechanism switching power transmission to a second large-diameter pulley, and a first and a second belt clutch mechanism are providedwith a first and a second arm members, tension clutch pulleys installed at point portions of these arm members, and actuators which rotate a first and a second arm members in such a way that a position at which a first no-end belt (13) is wound on the first large-diameter pulley is switched to a position at which winding is avoided, and, at the same time, a position at which a second no-end belt is wound on a second large-diameter pulley is switched to a position at which winding is avoided.