An energy-saving air purification device comprises a cylindrical casing, a fan, a cylindrical main filter, an air humidifier, a solar cell panel and a plurality of arc-shaped auxiliary filter discs. The top of the casing is provided with an air inlet, the circumferential side wall of the casing is provided with a plurality of arc-shaped auxiliary filter disc mounting openings, and each auxiliary filter disc mounting opening is internally provided with one auxiliary filter disc； the main filter and the casing are coaxially disposed, and the main filter is mounted in the casing； the main filter is provided with an axial through hole, the through hole and the air inlet are concentrically arranged, and the fan is mounted in the through hole and located at the end of the through hole close to the air inlet； the casing is mounted in a round groove formed in the top surface of the air humidifier, the top surface of the air humidifier is also provided with an annular spray nozzle, and the spray nozzle is arranged around the outer sides of the auxiliary filter discs. The solar cell panel is connected with the fan and the air humidifier through a current-rectifying voltage-stabilizing device. The energy-saving air purification device provided by the present invention can purify and humidify air at the same time and is simple in structure and low in cost.
