The invention provides a boiler for recovering heat from exhaust gas, and belongs to the technical field of boiler equipment. The boiler adopts the structure that an exhaust gas inlet (2) and an exhaust gas outlet (3) are respectively formed in the upper part and the lower part of a boiler body (1); a plurality of heat conduction pipes (4) are arranged in the boiler body (1), and mounted on supporting rings (5), and arranged horizontally. The boiler not only is simple in structure, but also can be used for treating absorbing, so that the dust can be prevented from accumulating on the heat conducting pipes, the heat conducting properties of the heat conducting pipes can be relatively high, and the heat recovery efficiency of the boiler can be improved.