The invention discloses a dust-removing heat pipe exchanger, comprising gravitational heat pipes, a center barrel, an upper barrel, a flat-plate head, an arch baffling board, an inflow pipe, an outflow pipe, a pipe plate, a flange, a lower barrel, a tangential intake pipe and a dust discharge pipe. The dust-removing heat pipe exchanger is characterized in that the gravitational heat pipes are vertically fixed on the pipe plate in a concentric circle form, with their condensing and evaporating segments located in upper and lower barrels; the upper and lower barrels are connected integrally with the flange through the pipe plate, and a plurality of the arch baffling plates are arranged inside the upper barrel; the center barrel is perpendicularly fixed to the center of the pipe plate, the lower end of the center barrel is flush with the lower end of the tangential intake pipe, and the upper end of the center barrel extends of the flat-plate head. In operation, high-temperature exhaust enters the lower barrel from the tangential intake pipe, solid impurities in the exhaust are discharged from the dust discharge pipe after the exhaust is subjected to centrifugal separation, the exhaust exchanges heat with the heat pipes and transmits the heat to water in the upper barrel, and purified gas enters the center barrel and exchanges heat again with a fluid through the center barrel before being discharged. The dust-removing heat pipe exchanger is compact in structure and has dust removing and energy saving functions.