The invention relates to a self-cleaning filter (1) for liquids comprising a body (10) that includes a first chamber (20), with an inlet (14) for a liquid to be filtered, and a second chamber (30), with a liquid outlet (33), wherein the two chambers are substantially superimposed and communicating by means of a flat filter medium (40), wherein the first chamber (20) is in communication with a discharge passage (26) for elimination of unwanted material, said discharge passage being closed by a closing element (50) mounted rotatably in the first chamber (20), and wherein at least one scraper element (60) is connected to the closing element (50) and is in contact with the filter medium (40) so that, following rotation, said scraper element (60) can remove any accumulation of unwanted material that has deposited on the filter medium (40) and convey it toward the discharge passage (26).