<p>In a slag crushing device according to the present invention, a cylindrical body (3) having a slag insertion port (1) in its one end and a discharge port (2) in the other end is rotatably provided around a shaft center (X) so inclined that the position of the discharge port is below the position of the slag insertion port. At least one crushing annular body (4A) having a smaller radius than that of the cylindrical body and idled parallel with the shaft center of the cylindrical body is arranged inside of the above cylindrical body. This crushing annular body is guided by a guide frame (4C) provided on the inner periphery of the cylindrical body. The guide frame is provided with apertures (4B, 4D) for introducing slag into the crushing annular body and apertures (4E) for discharging the slag crushed. <IMAGE></p>
