Secondary negative-pressure dust removal machine

The utility model relates to a secondary negative pressure dust settler which is a dust removing device suitable for underground coal mining machines in coal mine for reducing coal smoke amount produced when the coal mining machine cuts coal. A nozzle support is arranged on a machine body, a plurality of nozzles are arranged on the nozzle support, the nozzles are communicated with a water inlet pipe, a spraying cover which is a cylindrical body with openings at the front and rear ends is arranged on each nozzle correspondingly. When the dust settler is used, coal dust enters into the spraying cover for forming the secondary dust settlement and improving the dust settling efficiency; the jetting range of water mist is remote and automation effect is good owning to stream guidance function of the spraying cover; moreover, the nozzles are arranged in the machine body, therefore, the nozzle can not be damaged owning to collision, and is durable in use.