The present invention relates to a scale separation apparatus of the slab which can effectively remove the scales generated on the slab surface in heating the steel sheet after the step, the scale detachment device of the slab in accordance with one embodiment of the invention is installed in a path that the slab is moved an apparatus is to peel the scale formed on the surface of the slabs to be moved, as a device for peeling the scale slab is installed on the path where the movement is formed on the surface of slabs to be moved, that is surrounding the movement path of the top slab the slab is drawn Conduit And that the body and the slab is provided with tunnel-shaped outlet openings to be drawn; And the first peeling unit which is installed in the inlet of the main body is rotated while in contact with the upper surface of the slab while the slab is moved one peeling away the scale with respect to the total area of ​​the upper surface of the slab; And injection unit which is installed in the main body, while the slab is moved by high-pressure jets of water of the second peeling away the scale with respect to the total area of ​​the upper surface of the slab; Second peeling which is installed in the outlet of the main body, wherein the slab is optionally raking slab upper surface with respect to a region separating the scaled three drive of the movement that the scale is not removed by the jet unit of the upper surface of the slab area while the comprising the unit, the first pivot axis of the first separation unit is provided in the inlet upper portion of the body and, in the first rotational body wherein is provided a first pivot axis that is rotated in the movement path direction of the slab, the first It is installed to be rotatable on a lower end of the pivot member while in contact with the slab includes a rotating roll which cloud operation while pressing the upper surface of the entire area of ​​the slab by its own weight.