Filter element equipped with variably spaced reverse-washing filter

The invention relates to a filter element equipped with a variably spaced reverse-washing filter. The filter element comprises a valve body, a filter element shell and a filter element assembly, wherein a liquid outlet is formed in the middle position at the upper end of the valve body; liquid outlets and reverse discharge openings are formed in the lower end of the valve body; the filter element shell is mounted in the valve body; the filter element assembly is mounted in the filter element shell and comprises a framework provided with filter holes; an end head is mounted at the bottom end of the framework; a lower seal cover is mounted on the side near the end head of the framework; an upper cover sleeves the other side of the framework; a ring-shaped groove is formed in the inner side wall at the upper end of the upper cover; a driving block corresponding to the ring-shaped groove is arranged on the outer side wall at the upper end of the framework, and can move up and down along the ring-shaped groove; a tension spring sleeves the outer circumference surface of the framework. The filter element has the advantages that during reverse discharge, clear water is utilized for pressing the driving block to drive the framework to move downwards, so that the tension spring can be extended, spaces in the tension spring can be enlarged, and then impurities on the tension spring can be conveniently washed by the clear water.