According to the present invention, rice hull grinding device is installed at one side of the chaff storage tanks, the chaff storage tank that chaff is stored and extending from the hot-air generating means and the chaff storage tank having a hot air supply pipe which hot air is supplied to the hot-air feed pipe through installed on the chaff feed tube and an end of the hot air supply pipe for piggybacking rice hulls in hot air blown separation using a centrifugal force due to turning the rice hull mixed with a hot air stream, and at least one of delaying the mixing time of the hot-air chaff separating means, is provided at the lower part of the separating means includes a grinding means for grinding the dried rice hull.
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