The invention discloses an environmental-friendly chimney device for removing stains of an inner wall in a manner of heating and circulating water vapor by waste gas afterheat. The environmental-friendly chimney device structurally comprises a joint pipe, a movable base, a water inlet pipe, a device shell and a movable smoke discharging device, wherein the movable smoke discharging device is positioned in the device shell and is also fixedly connected with the device shell, and water flow formed on a heating rack is heated through afterheat of waste gas, and thus, the produced water vapor is adsorbed on an electrified rack along with the dust, the dust is carried and discharged after condensation is carried out, dust stacked in the device can be prevented, and air flow is separated by using an adsorption rack, and therefore, the inner airflow can be adsorbed by activated carbon preferably, and cleaner gas can be exhausted; through combination of a plurality of equal-size adsorption layers, inner airflow is subjected to subdivision directional output through small hole tubes, and adsorption treatment on a small part of airflow is carried out by using a single adsorption layer; and moreover, the inner activated carbon can be conveniently taken out and replaced in a pushing-embedding mounting way, and the waste of the activated carbon can be reduced.