There is provided a grain-milling machine capable of shortening the time required for lot changing and reducing electricity costs. A grain-milling machine comprising a vertical abrasive type grain-milling unit and a vertical friction type grain-milling unit mounted on a pedestal, the abrasive type grain-milling unit and friction type grain-milling unit being located on upper and lower portions of the pedestal, respectively, the abrasive type grain-milling unit including a milled grain discharge trough, the friction type grain-milling unit including a grain feed trough to which the milled grain discharge trough of the abrasive type grain milling unit is connected, and a two-way grain feed trough and change-over valve located above the abrasive type grain-milling unit and capable of selectively feeding grains either directly to the friction type grain-milling unit or to the friction type grain-milling unit via the abrasive type grain-milling unit.