Movable cleaning device for building machinery

The movable cleaning device for the building machinery comprises a base, the base comprises a sewage tank and a hollow plate located on the upper portion of the sewage tank, supporting plates are vertically and fixedly arranged on the left side and the right side of the base, four supporting leg blocks are fixedly installed below the base, and walking wheels are installed on the two sides of each supporting plate through lifting assemblies. The lifting assembly comprises a lifting support fixed to the supporting plate, a lead screw is rotationally connected into the lifting support, a lead screw motor is fixedly installed at the top of the lifting support and is in transmission connection with the lead screw, a lead screw nut is installed on the lead screw, guide rails are symmetrically arranged on the two sides of the lead screw, and guide blocks are slidably connected to the guide rails. The lead screw nut is fixedly connected with a guide block, the guide block is fixedly connected with a vertically-arrang