Building site dust falling device based on green and civilized construction

The utility model discloses a building site dust falling device based on green and civilized construction. The building site dust falling device comprises a movable cabinet, a water storage barrel, a water pump and an air duct. A water storage barrel is connected to the bottom face in the movable cabinet, the movable cabinet serves as a bearing foundation, and the base is connected to the bottom of the movable cabinet. One end of the flow guide pipe is connected to the water pump, a connecting shaft is connected to the peripheral face of the air duct and connected into a bearing seat in a penetrating mode, a supporting frame is connected to the lower portion of the bearing seat, and the supporting frame is arranged at the top end of the hollow shaft. Large and small particles carried in air can be filtered in a graded mode through a filter screen, filter cotton and an activated carbon plate, then water mist is prevented from being polluted, two sets of supporting frames move inwards at the same time by manual