The utility model discloses a but recuperative heat's thermal power generation boiler, including steam chamber, water pump and water storage box, the inboard in steam chamber is provided with fires burning furnace, and the outside in steam chamber installs the drain pipe, the upper end in steam chamber is collected the room through steam pipe with steam and is connected, and the steam downside ofcollecting the room is connected with steam power plant, the outside of water pump is connected with the steam chamber, and the outside in steam chamber installs the chimney, the blast pipe is installed to the upper end of water storage box, and the outside of water storage box is fixed with the inlet tube, the inside in steam chamber is fixed with first filter screen and second filter screen, thedownside that fires burning furnace is provided with the water guide chamber, the internally mounted of water storage box has the breather pipe. This but recuperative heat's thermal power generationboiler is fixed with the breather pipe in the inside of water storage box, can carry out thermal recovery work to work steam later to improve the working property of whole device.