The present invention relates to a tube-insertion type filtration device, and more specifically, to a filtration device which separates impurities from influent water including the impurities and entering a tube and which passes the filtered water therethrough. Provided is the tube-insertion type filtration device, comprising: a filtering part which is disposed such that a space is formed between the outer circumferential surface thereof and the inner wall of a tube, in which filters are provided on one side surface thereof and the outer circumferential surface, and which includes a first flange protruding from the other side outer circumferential surface so as to come into close contact with the inner wall of the tube； and a drain part which includes a hollow connection tube configured to extend to the other side surface of the filtering part and to communicate with the inside of the filtering part, a second flange configured to protrude from the other side of the outer circumferential surface so as to come into close contact with the inner wall of the tube, and an accommodation space formed in a space between the first flange and the second flange； wherein a hole or recess-shaped through hole is formed in the first flange, the impurities of the influent water are accumulated in the accommodation space via the space and the through hole, and water flows into the filtering part via the filters and moves through the connection tube. By using the above-described configuration, impurities attached to or inserted into the filters can be separated by means of the rotating force of influent water by rotating the influent water flowing into the tube of a sprinkler, thereby providing the effect of constantly cleaning the filter.본 발명은 관내 삽입형 여과기에 관한 것으로, 관으로 유입되는 불순물을 포함한 유입수로부터 불순물을 분리하고 여과된 물을 통과시키는 여과기로서, 외주면과 상기 관의 내벽 사이에 이격 공간이 형성되도록 배치되고, 일측면과 외주면에 필터가 구비되고, 타측 외주면에 상기 관의 내벽과 밀착되도록 돌출 형성된 제1 플랜지를 포함하는 여과부, 및 상기 여과부의 타측면에 연장 형성되고 상기 여과부의 내부와 통공되는 중공의 연결관이 형성되고, 상기 연결관 타
