To efficiently classify the solid waste without increasing the voltage to be applied by electrifying crushed solid waste to be classified that falls between high voltage electrodes from above, attracting the crushed solid waste by a metallic drum electrode placed right below the space between the high voltage electrodes and as the result, classifying the crushed solid waste into attracted solid waste and non-attracted solid waste to recover them respectively.

In this device, at the time of classifying crushed solid waste obtained by crushing municipal solid waste, bulky solid waste, etc. into plastic or combustible solid waste, etc. and the other solid waste, crushed solid waste to be classified 13 is allowed to fall and electrified by applying a high intensity electric field from an electrifier 17 consisting of plural wires placed horizontally and parallel to each other, to the solid waste 13 and then, the electrified solid waste 13 is blown on a metallic drum electrode 14 with an ion wind formed by the high intensity electric field. At this time, when the electrified solid waste is electrically conductive crushed solid waste 13A, the solid waste 13A is separated from the metallic drum electrode 14 by the repulsive force caused between them to allow the solid waste 13A to fall into the first separation vessel 22. On the other hand, when the electrified solid waste is insulating crushed solid waste 13B, the solid waste 13B is attracted by the metallic drum electrode 14 and rotated in that state. Then, the attracted solid waste 13B is scraped down from the drum electrode 14 with a brush 20 to allow the solid waste 13B to fall into the second separation vessel 23 and to recover the solid waste 13B.