The utility model relates to a chimney device, a steam-injection boiler and a boiler. The chimney device comprises a chimney body and a chimney cover. The chimney body is provided with a top opening. The chimney cover is used for opening or closing the top opening. The chimney device further comprises a long-distance opening-closing mechanism which comprises a guiding piece, a traction rope and an operation piece. The guiding piece is arranged on the chimney body directly or indirectly. A first end of the traction rope is connected to the chimney cover. The middle portion of the traction rope extends downwards after passing through the guiding piece. A second end of the traction rope is connected to the operation piece. The operation piece is used for pulling or loosening the traction rope, and accordingly the top opening is opened or closed by operating the chimney cover. By operating the long-distance opening-closing mechanism, under a long distance, the chimney cover can be opened or closed manually, and accordingly various shortcomings of an automatic cover chimney device in the prior art are overcome.