Dust falling mechanism for construction site

The utility model relates to an anti-blocking building engineering construction site dust falling mechanism, in particular to a construction site dust falling mechanism which comprises a water tank and a power box, the power box is fixedly connected in a bearing on the upper surface of the water tank, a direction adjusting assembly is arranged on the outer surface of the power box, and water in the water tank is pumped through a water pump. Water mist is discharged into a flow dividing pipe and an atomizing spray head through a water discharging pipe, the water mist is sprayed into the air through the atomizing spray head, dust contained in the air is filtered through an air filter screen, a servo motor d drives a third gear b and a third gear a to rotate, and the third gear a drives a connecting rod, a brush and fan blades to rotate. The brush rotates to sweep dust adhered to the surface of the air filter screen, fan blades rotate to widen the water mist spraying range, and the problems that a nozzle of an e