Dust falling device for house building construction

The invention provides a dust falling device for house building construction, which comprises a supporting mechanism and a spraying mechanism, the supporting mechanism comprises a base, a bracket is arranged above the base, a pressing assembly is arranged above the bracket, the pressing assembly comprises a pressing plate, and a plurality of limiting pieces are arranged on the upper surface of the pressing plate; wherein the limiting piece comprises a limiting plate, the limiting plate is connected with the side plate, a connecting ring is arranged on one side of the limiting plate, and a connecting piece is arranged at the end, away from the limiting plate, of the connecting ring. Meanwhile, a limiting piece is arranged on the upper surface of the pressing plate and comprises a connecting ring and a limiting plate, the connecting ring is connected into the limiting plate in a sleeved mode, the branch pipe can be extruded under the action of the connecting ring, and therefore the branch pipe can be prevented