Anti-blocking dust falling device

The utility model relates to the field of construction dust falling, in particular to an anti-blocking dust falling device which comprises a fog gun machine body, and a gun barrel is installed on the top of the fog gun machine body. The anti-blocking mechanism is used for preventing a spray head mounted in the gun barrel from being blocked and is mounted at one end of the gun barrel; by arranging the transmission assembly, when the fog gun machine body and the gun barrel are placed on a construction site, a motor drives a driving belt pulley to rotate, the driving belt pulley and a driven belt pulley drive a cross rod to rotate through transmission connection of a transmission belt, and one end of a rotating plate is driven to rotate; and then a rotating plate and a connecting plate are rotationally connected to drive a fixing plate to ascend, so that a circular frame is driven to ascend to prevent dust at one end of the gun barrel, dust prevention can be performed on the nozzle end of the gun barrel when the