The utility model relates to a dedicated clamping device for a cross air blow horizontal filter. The dedicated clamping device comprises a cross air blow horizontal filter body, and is characterized in that a baffle is arranged on the cross air blow horizontal filter body; rectangular holes are formed in the cross section of the baffle; a sealing strip is stuck on the bonding surfaces of the baffle and a clamping groove; the clamping groove is welded on one side of the cross air blow horizontal filter body; rectangular openings are formed in the cross section of the clamping groove; the baffle 3 is embedded in the clamping groove; the rectangular openings in the cross section of the baffle correspond to those in the cross section of the clamping groove; jacking blocks are mounted in the overlapped rectangular openings of the baffle and the clamping groove; a threaded through hole is formed in the middle of each jacking block; a tightness adjusting pentangular handle is arranged in the threaded through hole. The dedicated clamping device has the advantages that the structure is simple; the processing and manufacture are convenient; through the matching among the tightness adjusting pentangular handles, the jacking blocks and the clamping groove, the cross air blow horizontal filter can be clamped and sealed simply and effectively; the operation of drilling on the cross air blow horizontal filter is eliminated; as the off-position time is shortened, the spinning yield is increased to a certain extent.