The present invention relates to a device for decontaminating surfaces such as a wall, floor or ceiling of a building or the like, comprising one or more toxic products such as asbestos, lead (Pb), PCBs (biphenyls) polychlorinated) and polycyclic aromatic hydrocarbons (PAHs) for example, present in many products with many applications such as, floor coverings and ceilings, wall coatings (paint, insulation, etc ...), road surfaces , bituminous glues, vapor barriers, waterproofing materials, the walls of treatment plants, the walls of water towers, or the like； said device is remarkable in that it comprises at least one hydrodecapage head (1) fed by a high-pressure group (2) and connected to a suction source (3) comprising a connected vacuum source (4) a cyclonic head (5) mounted on a container (6) in which water containing toxic products and residues from the support is collected, a first filtration system (7) consisting of a filter press whose inlet is fed by the water loaded with toxic products collected in said container (6) and whose output feeds a buffer tank (8) in which the water from the first filtration comprises particles less than or equal to 5 microns. Another object of the invention relates to a process for decontaminating surfaces.La présente invention concerne un dispositif de décontamination de surfaces telles qu'un mur, un sol ou un plafond d'un bâtiment ou similaire, comportant un ou plusieurs produits toxiques tels que l'amiante, le plomb (Pb), les PCB (biphényles polychlorés) et les hydrocarbures polycycliques aromatiques (HAP) par exemple, présents dans de nombreux produits ayant de nombreuses applications telles que, les revêtements de sols et plafonds, les revêtements de mur (peinture, isolation, etc...), les revêtements routiers, les colles bitumineuses, les pare-vapeurs, les matériaux assurant l'étanchéité, les parois des stations d'épuration, les parois des châteaux d'eau, ou similaires, ； ledit dispositif est remarquable en ce qu'il compren
