The invention discloses an intelligent spraying equipment and a spraying method for building exterior walls, including a paint pump, a spray head, a mixing bucket, a left and right moving track, a hose, a camera, a conduit, a hoist, a guide cable tensioning machine, a pulley, an intelligent The processor, monitoring display and operation switch, the mixing bucket are connected to the nozzle through the paint pump and the hose in turn, and the nozzle is slidably connected to the left and right moving tracks. The two sides of the spraying platform are fixed, the lower end of the guide rope on the guide rope tensioning machine is fixed on the wall, the conduit is slidably connected to the guide rope, the guide rope is provided with an anti-fall clamping protector, and the pulley is set on the hoist Above, the steel wire rope is set on the pulley, and the intelligent processor is connected with the paint pump, the camera, the guide rope tensioner, the hoist, and the anti-fall clamping protector. It effectively reduces the safety of construction personnel, improves production efficiency and process stability.