Mining automatic dust falling device

The utility model discloses a mining automatic dust falling device which comprises a truss and a movable driving system arranged at the top of the truss, and the movable driving system extends along the two ends of the top of the truss. The dust falling mechanism is mounted on the moving driving system, and the dust falling mechanism is connected with a water pump in an external water storage tank through a water supply hose; the dust falling mechanism comprises a telescopic support with an adjustable coverage area, a first motor used for driving the telescopic support to adjust the coverage area and a plurality of nozzles evenly distributed on the telescopic support, and the nozzles communicate with the water supply hose. A manager controls the first motor to drive the telescopic support to adjust the coverage area through an external controller, and therefore the spraying range can be adjusted. In addition, the moving driving system can drive the dust falling mechanism to move along the top of the truss, an