Dust falling device applied to water conservancy project construction site and mounting method of dust falling device

The invention discloses a dust falling device applied to a water conservancy project construction site. The dust falling device comprises a vehicle body, a first rotating mechanism is arranged on one side of the upper end of the vehicle body, a limiting mechanism is arranged on the first rotating mechanism, four wheels are arranged in the limiting mechanism, openings are formed in the middles of the four wheels, and a shell is jointly fixed to the upper ends of the four wheels; and a second rotating mechanism and a second conveying mechanism are arranged in the shell, and a lifting mechanism is arranged on one side of the second rotating mechanism. The invention discloses a mounting method of the dust falling device applied to the water conservancy project construction site. According to the device, the device can conduct 270-degree transverse rotary spraying on the vehicle body and move up and down to achieve spraying at different distances, so that the large-range dust falling effect on a construction site