Building environment-friendly dust falling mechanism

The utility model relates to a building environmental protection dust fall mechanism, including casing, water tank and cart, water tank and cart are respectively fixed connection at the both ends of cart top, the top of water tank is fixed connection with the water inlet, the top of casing is fixed connection with the water pumping cylinder, the water pumping pipe is fixed connection between the water pumping cylinder and water tank, and the water pumping pipe is fixed connection with the water tank. A water outlet pipe is fixedly connected between the bottom of the water pumping barrel and the machine shell, one end of the water outlet pipe extends into the machine shell and is fixedly connected with an atomization spray head, a piston is slidably connected into the water pumping barrel, and a displacement assembly is arranged at the top of the machine shell and used for driving the piston to move. The utility model aims to solve the problems that a large amount of dust is inevitably attached to a filter scr