Self-cleaning filter

The utility model belongs to the technical field of water treatment and particularly relates to a self-cleaning filter. The self-cleaning filter comprises three filtering chambers (10, 20 and 30) in parallel connection, three filtering elements (11, 21 and 31), a water inlet pipeline (3), a switching valve (2), a water outlet pipeline (4), a waste liquid pipeline (5) and a pressure monitoring alarm system (6), wherein the three filtering elements (11, 21 and 31) are respectively located in the three filtering chambers; the water inlet pipeline (3) is used for feeding pre-treating materials; the switching valve (2) is located between the water inlet pipeline and the filtering chambers and is provided with four pipelines (b1, b2, b3 and e); the water outlet pipeline (4) is connected with the filtering chambers and is used for discharging filtrate; the waste liquid pipeline (5) is connected with the pipeline (e); and the pressure monitoring alarm system (6) is connected with the switching valve (2). The self-cle