Building exterior wall coating spraying device

The utility model discloses a coating spraying device for a building outer wall, which belongs to the technical field of buildings and is characterized by comprising a transport case, two sliding rods are arranged on the right side of the transport case, a spraying mechanism is arranged at the tops of the right sides of the sliding rods, and a case cover is rotatably connected to the front side of the transport case. A pigment barrel is fixedly mounted at the top of an inner cavity of the transport box; the spraying mechanism comprises two connectors, a plurality of spraying heads, a square pipe and two spraying pipes, the front side and the rear side of the square pipe fixedly communicate with the two connectors correspondingly, and the right sides of the spraying heads fixedly communicate with the front sides of the square pipe and the spraying pipes correspondingly. The problems that in the prior art, an outer wall is generally sprayed by a worker through a spray pipe, and due to the fact that the worker c