The utility model relates to a medium-sized tube novel cigarette filter. A filtering device is arranged in the filter and is structurally characterized in that a medium-sized tube is sheathed outside small-sized tubes; a gap is reserved between each small-sized tube and the medium-sized tube; large-sized tubes are sheathed outside the medium-sized tubes; a gap is reserved between the medium-sized tube and each large-sized tube, and the medium-sized tube, the small-sized tubes and the large-sized tubes are concentric in position; the lower mouth of each large-sized tube and the lower mouth of each small-sized tube are connected through a bottom cover; the upper mouth of the medium-sized tube is connected with a medium-sized tube upper cover; the upper mouth of each small-sized tube and the lower mouth of a protruded tube are connected through small-sized tube upper covers; the small-sized tubes and the protruded tube are concentric; and the upper mouth of the protruded tube is connected with the lower surface of the medium-sized tube upper cover. A gap is reserved between each small-sized tube upper cover and the lower surface of the medium-sized tube upper cover, and the small-sized tube upper covers are respectively provided with a smoke through hole. Filtering materials are filled outside the large-sized tubes. A cigarette body is connected with acetate fiber tows of the filtering materials below the bottom covers, and the smoke of the cigarette is filtered after passing through the acetate fiber tows of the filtering materials below the bottom covers, the interiors of the small-sized tubes, the smoke through holes respectively arranged on the small-sized tube upper covers, the interior of the medium-sized tube, the interiors of the large-sized tubes and the filtering materials outside the large-sized tubes.