Abstract: An air cleaner for removing air pollutants by a water spray type of dust collecting system, which includes a dust collecting part and an air and water separating part in the interior of an air duct, the dust collecting part composed of primary and secondary dust collectors by water spraying, each of which having a plurality of spraying nozzles layeredly arranged by predetermined intervals to be opposed at an angle of 30° from the top to bottom thereof, and a space dust collector by water spraying disposed in a space between the primary and secondary dust collectors by water spraying, such that the three-step air and water contact causes foreign materials such as dust, gases and so on to be absorbed, dissolved and settled, and the air and water separating part formed of a groove-engaged type and layeredly curved by six-step folding at an angle of 90° in consideration of air resistance, for passing only the air flowing from the dust collecting part and collecting water drops.