Afterheat recovery energy-saving device adapting to chimney

The utility model aims at providing an afterheat recovery energy-saving device adapting to a chimney. The afterheat recovery energy-saving device comprises an upper conducting ring and a lower conducting ring, wherein the upper conducting ring and the lower conducting ring are in hollow structures, a heat exchange pipe is arranged between the upper conducting ring and the lower conducting ring, the heat exchange pipe is respectively communicated with the upper conducting ring and the lower conducting ring, the upper conducting ring and the lower conducting ring are respectively and fixedly arranged on the inner wall of the chimney through connecting sheets, and a water inlet and a water outlet are formed in the upper conducting ring. The afterheat recovery energy-saving device has the advantages that the smoke gas heat is recovered, the recovered heat can be used as boiler supplementing water and domestic water according to requirements, an automatic cleaning device is used for cleaning dust adsorbed on the s