To provide a coating unit for automatically supplying coating material.

The coating unit for automatically supplying coating material is provided in which a coating crawler 3 comprising a loop-shaped belt 2 having a sponge 1 pasted on the surface thereof is arranged so as to be vertically stretched with an upper rotary roller 4 and a lower rotary roller 6 which are freely rotatably attached to a coating bucket 7 through pins 8, respectively. The coating unit for automatically supplying coating material is configured in such a manner that the upper rotary roller 4 in the coating crawler 3 is pushed to a wall 5 and the lower rotary roller 6 is immersed in the coating bucket 7, consequently the belt 2 rotates and the coating unit automatically supplies coating material by moving the coating unit vertically.