The invention discloses a boiler exhaust smoke waste heat deep recovery device and relates to the technical field of waste heat recovery. The key of the technical scheme is that the boiler exhaust smoke waste heat deep recovery device comprises a chimney, the chimney comprises a smoke inlet communicating with a boiler flue, multiple heat pipes and capillary pipes are arranged in the chimney in a penetrating manner and are made of metal, the two ends of each heat pipe and the two ends of each capillary pipe are connected with the side walls of the chimney correspondingly, and the heat pipes arelocated between the capillary pipes and the smoke inlet; a water inlet pipe and a water outlet pipe are arranged outside the chimney, all the heat pipes communicate with the water inlet pipe, and thecapillary pipes communicate with the water outlet pipe; a communicating pipe is further arranged outside the chimney, the communicating pipe enables the ends, far away from the water inlet pipe, of the heat pipes and the ends, far away from the water outlet pipe, of the capillary pipes to communicate. The boiler exhaust smoke waste heat deep recovery device has the advantages of quick heat recovery response and rapid water temperature rising; through arrangement of ash removing plates and a driving mechanism, ash removal can be conducted on all pipelines to ensure the thermal conductivity, heat collecting plates can be separated from the capillary pipes, and clean and thorough ash removal can be conducted on the capillary pipes and the heat collector plates.