Dust falling device for highway construction

The invention provides a dust fall device for highway construction, and relates to the technical field of construction dust fall, the dust fall device comprises a fixed pipe and a construction guardrail, a mounting frame is fixedly mounted at the bottom of the fixed pipe, the mounting frame is fixedly mounted at the top of the construction guardrail, and the upper end of the fixed pipe is fixedly connected and communicated with a water supply end; the upper end of the water supply end is fixedly connected with a top cover, a monitoring module is installed on the periphery of the water supply end, a plurality of water supply openings are formed in the surface of the upper end of the water supply end in a circumferential array mode, the bottom end of each water supply opening extends into the water supply end, and the monitoring module monitors a dust falling area. A control signal is sent to control a driving motor to work, so that the driving motor drives a driving shaft to rotate to drive a spline shaft, a d