Automatic dust falling device and method thereof

The invention relates to an automatic dust falling device, and discloses an automatic dust falling device which is used for sucking underground air into a spraying cylinder for primary spraying dust falling and then carrying out secondary filtering dust falling on residual coal dust in the underground air through a first filter screen and a second filter screen in a filter cylinder. Underground air can be sucked into the device, secondary dust falling is carried out on coal dust in the air, and the situation that a large amount of water mist is sprayed into a coal mine tunnel for dust falling, and the tunnel is wet and muddy is avoided. After underground air is subjected to primary spraying and dust falling, coal dust left in the underground air is subjected to secondary filtering and dust falling through cooperation of the first filter screen and the second filter screen, and the dust falling effect is better. And the rotating rod is matched with the first cleaning rod and the second cleaning rod, so that co