Abstract: An anion air purifier includes an air quality sensor control module, a high-voltage generator module arranged on a back side of the air quality sensor control module, and an anion generator module arranged on the back side of the high-voltage generator module. The air quality sensor control module includes a plurality of sensing elements arranged therein for sensing air qualities. The high-voltage generator module includes an anode dust arrester upwardly and protrudingly arranged at a center thereof. The anode dust arrester is a round flat hollow structure. The anion generator module includes a plurality of pins arranged thereon for releasing anion. Particles in the air binding with anion will be charged, so as to be attached on the anode dust arrester when flowing thereby and therefore leave clean air flow. Accordingly, it can effectively eliminate particles of the air, release massive clean air, and lower unnecessary ozonized ions.