Waterproof spraying device for decorative wall

The utility model relates to the technical field of wall construction, and discloses a decorative wall waterproof spraying device which comprises a bottom plate, a coating tank is fixedly installed on the top face of the bottom plate through a connecting base, spraying liquid is stored in the coating tank, a feeding port is formed in the top face of the coating tank, a plug is arranged on the feeding port, and the top face of the coating tank is provided with a water inlet. An electric air cylinder is fixedly installed on the top face of the bottom plate, a lifting rod is fixedly installed at the output end of the electric air cylinder, a material spraying device is arranged at the free end of the lifting rod, a roller coating device is arranged on the outer circle of the lifting rod, and the roller coating device comprises a main support and a sliding block. According to the spraying device, the sleeve is controlled to move left and right on the spraying pipe by rotating the sleeve, so that the spraying rang