The invention discloses a dust-free waste heat recycling steam boiler. Water flow which is sprayed out from a plurality of spraying holes in the dust-free waste heat recycling steam boiler is perpendicularly crossed with smoke discharged from a plurality of smoke vents; after absorbing waste heat and dust in the smoke, the water flow enters a waste heat recycling water sleeve; the dust is filtered out by a filtering sleeve; the water flow enters a transitional water tank, and then enters a heating water sleeve through a connecting pipe; the water level of the heating water sleeve is close to a secondary ignition opening; and high-temperature steam can be obtained after the water flow is heated by a gas burner. High-temperature tail gas generated by the fuel burner passes through a smoke passing passage between connecting pipes, a smoke collecting chamber and the smoke vents and then enters the waste heat recycling water sleeve; after the heat and the dust in the high-temperature tail gas are absorbed, the high-temperature tail gas are discharged via the smoke vents; the discharged tail gas does not contain harmful substances such as soot and carbon monoxide; and the temperature of the tail gas is close to normal temperature. The dust-free waste heat recycling steam boiler is energy-saving and environment-friendly.