Waste heat utilizing device for boiler

The utility model discloses a waste heat utilizing device for a boiler. The waste heat utilizing device comprises a device body, a boiler chimney and a water pipe, wherein the device body is of a cuboid structure and is arranged at the intersection between the boiler chimney and the water pipe; water flowing tanks and flue gas tanks are formed inside the device body and are arranged in the device body in a cross every-other-row manner; the row number of the water flowing tanks adopting an every-other-row horizontal placement mode is 3 to 8; the row number of the flue gas tanks adopting an every-other-row vertical placement mode is 4 to 10. The waste heat utilizing device has the beneficial effects obtained by using the technical means are that the structure is simple, and the convenience for use is realized; by using the heat exchange principle of energy, the waste heat obtained by burning in the boiler is reasonably utilized, so production cost is reduced, and productive efficiency is improved; in addition, the requirements of energy conservation and emission reduction are achieved.