Filter device

The utility model discloses a filtering device which comprises a device body, the device body is provided with a water inlet area, a filter bag area and a water outlet area, the water inlet area, thefilter bag area and the water outlet area are sequentially distributed in the water flow direction during filtering, and the filter bag area is provided with a water passing channel; the filter bag isarranged in the filter bag area, and a bag opening of the filter bag faces downwards and is in butt joint with the water passing channel; the rapping device can rap the filter bag; and the sludge collecting device is arranged below the filter bag. Sewage flows through the water inlet area, the filter bag area and the water outlet area in sequence, pollutants such as sludge particles and the likein the filter bag area are intercepted in the filter bag, the particles gradually become large and heavy and then naturally fall into the sludge collecting device under the action of gravity, and purified water flows to the wat