Abstract: The device embodying the invention uses a hydraulic press activating a mobile plate in a chamber opposite a base on which a metal barrel can be disposed, and successively comprises: the placing and maintaining of the barrel on the base; the perforating of two opposite sides of the barrel by means of an elongated perforating mechanism running through the barrel from side to side and from top to bottom; the cleaning of the interior of the barrel by projection of a cleansing fluid under pressure by means of a rotary injection head integral with the perforating mechanism; and the crushing of the barrel by displacement of the plate towards the base. The invention notably concerns the processing of polluted metal barrels with a view to facilitating handling, storage and recycling thereof.