Building wall painting device and operation method thereof

The invention belongs to the field of building wall painting, and particularly relates to a building wall painting device and an operation method thereof.The building wall painting device comprises a base, a support is fixedly connected to the top of the base, a lead screw is rotatably connected to the inner wall of the support, a motor is fixedly connected to the top of the base, and the output end of the motor is fixedly connected with a first bevel gear; the outer wall of the lead screw is fixedly connected with a second bevel gear. According to the building wall painting device and the operation method thereof, through cooperation of stirring teeth, a stirring plate and a second spring, a coating roller continuously shakes, the coating roller continuously shakes after being soaked in water in a water tank so that the cleaning effect on the coating roller can be improved, used water is filtered through a filter element in a lower pressing plate, and therefore the use effect of the coating roller is improve