The invention relates to a dust collector which comprises a dust collection mechanism, a gas-dust separation mechanism and a gas generation mechanism, wherein the interior of the dust collection mechanism is hollow and is provided with a gas flow cavity with a gas suction hole and a gas exhaust hole; the interior of the dust collection mechanism is further provided with a dust collection cavity formed outside the gas flow cavity in a surrounding manner; the gas-dust separation mechanism is used for separating gas and dust, the dust formed after separation is deposited in the dust collection cavity, and the gas formed after separation flows to the gas suction hole; the gas generation mechanism is at least partially assembled in the gas flow cavity and is used for providing power for the gasto flow in the dust collector; the dust collection cavity and the gas flow cavity have a common wall; and the gas generation mechanism abuts against the common wall to transmit vibration to the common wall. When the gas generation mechanism works, the vibration of the gas generation mechanism is transmitted to the common wall, and the common wall vibrates together with the gas generation mechanism; and due to the fact that the common wall is used as the cavity wall of the dust collection cavity, the dust deposited on the wall surface of the dust collection cavity is separated from the wall surface to be deposited at the bottom of the dust collection cavity under the vibration action, and the relatively good dust falling effect is achieved.