The invention belongs to the field of household appliances, and relates to an air circulating device, an air purifier and an air humidifier. The air circulating device comprises a support seat, a fan,a centrifugal wind wheel, a volute and a driving mechanism, wherein an air hole is formed in the support seat; the volute is rotatably connected with the support seat, a through hole which communicates with the air hole is formed in one end, which is close to the support seat, of the volute, and an air outlet is formed in the side surface of the volute; a mounting part is arranged in the air hole, and a plurality of connecting ribs are connected between the mounting part and the inner side wall of the air hole; the fan is fixedly arranged on the mounting part, a main shaft of the fan passes through the through hole and extends into the volute, the centrifugal wind wheel is fixedly connected to the main shaft of the fan, and the centrifugal wind wheel is located in the volute; and the driving mechanism is connected with the volute and is used for rotating the volute. When the volute rotates, the fan is kept fixed all the time, and therefore, the problem of wrapping connection is avoided, so that the integral structure is simplified, and the production and manufacturing cost is reduced.