Abstract: This patent covers an automatic and autonomous floating purifier consisting of a normally cylindrical and upright housing (1) with numerous compartment (4) each divided into two chambers (5, 7), the outer chamber (5) being supplied with polluted water through inlet openings (6) at water surface level where as the other chamber (7) is acting as a collecting tank for the pollutant, which is sticking to a mobile belt (8); a large number of mobile boxes (13) moving on the water surface by means of sliding or articulated devices, receiving the polluted water; numerous suction pumps (17) each aspirating the water from a set of boxes; one or more discharge outlets in the chamber (5) of the compartments (4) discharging the pollutant radially below the water surface so as to create a toroidal circulation by which the surface pollutants are accumulated and directed towards the chambers (5) of the compartments (4) where the oil is separated from the water by adhesion to the belt (8); a storage tank (20) for the pollutan