Dust falling device for building construction site

The invention discloses a dust fall device for a building construction site, and relates to the technical field of earthwork dust fall, the dust fall device comprises a bottom frame, and further comprises a fixing frame, the inner wall of the fixing frame is slidably connected with a supporting rod, and the side wall of the fixing frame is further provided with a height adjusting component for adjusting the height of the supporting rod; the rotating rod is rotationally connected to the top wall of the supporting rod, and the outer wall of the rotating rod is further provided with a dust removal component; the spraying adjusting part is matched with the dust removal part; the driving part is fixedly connected to the outer wall of the supporting rod, and the dust removal part comprises a sleeve rotationally connected to the outer wall of the rotating rod, a second bevel gear fixedly connected to the outer wall of the sleeve, a supporting frame fixedly connected to the outer wall of the sleeve and a spraying par