A filter device with a spirally flushing function with a head having a filter flask main body and a water inlet hole connected with a water inlet passage, a water outlet hole connected with a water outlet passage, and a flushing hole connected with a flushing passage. A filter element casing arranged outside the filter element, and has a plurality of filter element casing water inlets. A flow divider arranged outside the filter element casing and covering a portion of an upper end of the filter element casing. A filter element end cap fixed to the top of the filter element and having a water outlet, which penetrates through the flow divider and is connected with the water outlet passage. Effectively improved flushing effect, and greatly prolonged service life of the filter element is experienced.