The invention belongs to the technical field of underwater impurity treatment facilities, and in particular, relates to a novel net dredger for removing underwater net impurities. The novel net dredger comprises two regular triangular side frames (6) oppositely arranged; connecting rods (3) are erected and mounted among three sets of angles of the two side frames (6) to form a three-edge frame structure; multiple cross beams (4) are respectively erected and mounted among three sets of edges of the two side frames (6); multiple arched rake teeth (8) are fixedly mounted on the outer sides of all the cross beams (4) in the length direction; mandrels (5) are respectively arranged on the outer sides of the middle parts of the two side frames (6); and the two mandrels (5) share the center line. The novel net dredger further comprises left and right two pull rods (2); shaft sleeves are fixedly mounted at the inner ends of the pull rods (2), and lifting rings (1) are mounted at the outer ends; and respective shaft sleeves of the two pull rods (2) respectively sleeve the mandrels (5) on two sides. The net dredger is simple in structure, convenient for operation, not easy to block and high in single net dredging amount.