Heat exchange flue

The utility model relates to the technical field of heat exchange flues, and discloses a heat exchange flue which comprises a flue body, the flue body comprises a shell, a sliding groove is formed in the side surface of the shell, and a heat exchange device is assembled on the inner surface of the sliding groove. A cleaning frame capable of moving left and right is assembled on the outer surface of the heat exchange device, a displacement device is assembled on the side surface of the cleaning frame, during use, hot flue gas in a flue exchanges heat through the heat exchange device in cooperation with an external circulating pump, and when the heat exchange efficiency is reduced, an external motor is started to drive a screw to rotate and drive the cleaning frame to move left and right; when the flue heat exchanger is used, dust on the outer surface of the circulating pipe is cleaned, the dust is discharged through the dust falling pipe on the right side, in the using process, the bendable meshing cover moves