To provide a disc-type pumice-stone removing machine from which pumice stone being an impurity that can not removed by a conventional buckwheat stone extracting machine and having a gravity lower than that of buckwheat can be continuously removed for a long period of time.

In the disc-type pumice-stone removing machine, removal for a long time of period can be achieved by a continuous movement that buckwheat charged from a hopper (3) falls in a discharge gutter (13) to make permanent magnets (9) positioned above the discharge gutter (13) attract the pumice stone by its magnetic force to remove it on the way of being discharged to the outside; the permanent magnets (9) are disposed so as to surround a circumference of a rotary disc with a magnet that is rotationally moving. Therefore, the pumice stone in the attracted state passes through on a brush (14) positioned outside of the discharge gutter (13), when the pumice stone is stripped off by the brush (14) and then falls in a rail bar (22) to enter into a storage box for the pumice-stone removed, and the permanent magnets from which pumice stone is stripped off move into the discharge gutter (13) again by rotational movement to remove pumice stone.