The utility model discloses a negative pressure harness removing device of a filter stick forming machine set. The device comprises a fiber loosening gluing machine mounted on a rack, wherein a wire feeding ejector is arranged on the rack on one side of the fiber loosening gluing machine; the opening of the wire feeding ejector faces to a wire feeding roller rotationally mounted on the rack; a protecting cover is mounted on the rack between the wire feeding roller and the wire feeding ejector; an air sucker is mounted on the rack above the protecting cover; an air sucking tube which is arranged in an inclined manner is connected to the opening of the air sucking hole of the air sucker; the front end of the air sucking tube takes the shape of a horn; the horn is communicated with the protecting cover; a collecting tank is connected with an air outlet of the air sucker. The device is novel in structural design, flying and flocking wires generated from wire bundles are sucked and collected through the negative pressure generated by the air sucker together with the protecting cover, and due to arrangement of the filtering tank mounted on the air sucking tube, most impurities of large particles or large diameters can be filtered, and the filtration effect is good.