Dust falling device for construction site construction

The utility model relates to the field of building construction, in particular to a construction site construction dust falling device which comprises a water storage tank, and a water adding assembly is arranged at the top of the water storage tank. The bottom of the water storage tank is in sliding connection with the supporting frame through a guide assembly, rolling wheels are arranged at the four corners of the supporting frame, a connecting groove is formed in the supporting frame, the interior of the connecting groove is connected with the water storage tank through a rotating rod, and a driving assembly used for driving the rotating rod to rotate is installed in the connecting groove; connecting frames are fixedly installed on the outer walls of the two ends of the water storage tank, connecting rods are rotatably installed on the connecting frames and fixedly connected with the outer wall of the water storage tank through angle adjusting assemblies, a drainage pipe is fixedly installed at the outer e