The invention discloses a coating device. The coating device comprises a coating tank, a cover plate and a coating pump; the cover plate is arranged on the top of the coating tank, the coating pump isarranged in the middle of the top end of the cover plate, a low-liquid-level sensor is arranged on one side of the bottom of an inner cavity of the coating tank, a high-liquid-level sensor is arranged on one side of the top of the inner cavity of the coating tank, an indication lamp is arranged on the top of the outer side of the coating tank, a discharging pipe is arranged on one side of the inner cavity of the coating tank, a feeding pipe is arranged on the other side of the inner cavity of the coating tank, reinforcing ribs are arranged in the cover plate, a discharging opening is formed in one side of the cover plate and corresponds to the discharging pipe, a feeding opening is formed in the other side of the cover plate, and the feeding opening corresponds to the feeding pipe. An opening in the bottom of the feeding pipe is attached to the side wall of the inner cavity of the coating tank, the flow speed of coating entering the coating tank is reduced, the phenomenon that due tothe too high coating flow speed, air is brought to enter the bottom of the inner cavity of the coating tank can be avoided, and the spraying quality of the coating can be improved.