The utility model discloses an active dust suppression device which comprises an automatic atomization control system, a liquid pipeline and a steel structure support, wherein the liquid pipeline is arranged on the steel structure support; a plurality of sprayers are arranged on the liquid pipeline; the automatic atomization control system comprises a pumping device and a programmable logic controller (PLC); the PLC is electrically connected with the pumping device; the pumping device is communicated with the liquid pipeline; the PLC receives a temperature signal, a humidity signal, a wind signal, a wind direction signal and a granule concentration signal. By the existence of the automatic atomization control system, passive dust suppression is upgraded to be active dust suppression. The flowing speed of the air on the earth surface is reduced; by the existence of water fogs, flying dust granules can be combined with the water fogs to form large granules, and the dust granules can fall to the ground under the action of the gravity. Moreover, a layer of water film can be formed by a material stack through the water fogs, so that a dust suppression effect is greatly enhanced. The sprayers are in modular design consisting of nozzle seats comprising pipelines and independent detachable nozzles; different nozzles can be selected according to the difference of the stacked materials; the active dust suppression device is extremely high in suitability and convenient to maintain and replace.