Building construction dust falling device

The utility model discloses a building construction dust falling device which comprises a vehicle body, the top of the vehicle body is fixedly connected with a compartment, the top of the inner side of the compartment is fixedly connected with a water tank, a first motor is arranged to drive a rotary table to rotate, and a first electric push rod drives an atomization spray head to rotate on a supporting rod in a hinged mode. A second electric push rod is arranged to drive a sweeping roller on a fixing frame to be attached to the ground, so that the sweeping roller is driven to be attached to the ground; then a second motor drives a sweeping roller to rotate at a high speed through transmission connection of a first belt pulley and a second belt pulley to sweep the ground, and a water spraying box flushes the ground easily completed by the sweeping roller through a spray head, so that the dust falling range of the device is expanded; and in addition, the functions of sweeping and washing the ground can be ach