The invention discloses an air conditioning device, and particularly relates to a fresh air filtering dusting machine. The invention provides the fresh air filtering dusting machine which can filter air. The fresh air filtering dusting machine comprises a fan, an air supply outlet, an air treatment chamber and a filtering system, wherein the fan is communicated with the air supply outlet, a fixing frame is arranged on the mounting wall of the air treatment chamber, the air supply outlet is formed at the upper part of the mounting wall, the fan is arranged in the air treatment chamber by the fixed frame and is positioned at the upper part, an air inlet is formed at the bottom of the air treatment chamber, and the filtering system is arranged in the air treatment chamber and positioned between the air inlet and the fan. As the filtering system is adopted, when the fan is utilized to deliver fresh air indoors, outdoor air can be purified by the filtering system, and the filtering system adopts double layers of filtering, namely, a plate type activated carbon coarse effect filter and a plate type primary effect air filter, wherein the plate type primary effect air filter can filter dust, and the plate type activated carbon coarse effect filter can adsorb harmful substances, thereby improving quality of fresh air entering the room.