The invention relates to the energy-saving and environment protection technical field, in particular to an environment-friendly boiler. The environment-friendly boiler includes a boiler body; a boiler chamber is formed in the boiler body; one end of the boiler chamber is connected to one ends of smoke pipes, and an activated carbon adsorption layer is arranged on the other ends of the smoke pipes; a bag type filtering layer is arranged on the right side of the activated carbon adsorption layer; the bag type filtering layer has static electricity; two detectors are arranged on the right side of the bag type filtering layer, and are used for detecting if the cleaned gas reaches the standard or not; a first gas outlet is formed between the two detectors; the cleaned gas which reaches the standard is discharged out of the first gas outlet; a second gas outlet is formed in one side of the boiler body; an inductor is arranged on the second gas outlet; after gas with heat is discharged out of the first gas outlet, and high temperature gas can be reused in the boiler body; and when the pressure is too high, the inductor will has inductance, excess gas will be discharged outdoor, an energy saving and environment protection effect can be achieved, exhaust gas can be cleared up thoroughly, and an environment can be cleaned.