Embodiments of the present invention provide a device for forming air flow containing charged ions, comprising a fan member, a ring air blowing chamber defining a center opening, and an ionizing member, wherein, the ionizing member is arranged on an inner wall of the ring air blowing chamber facing the center opening for generating the charged ions, and the ring air blowing chamber comprises a ring passage and a nozzle part, the ring passage of the ring air blowing chamber is configured to receive air flow from the fan member, and the nozzle part is configured to face to the ionizing member.