A coating liquid storage tank and a micro gravure coating device having the same, the coating liquid storage tank including: a supply port to supply a coating liquid; a discharge port provided at a bottom of the storage tank to discharge the coating liquid; and a buffer plate provided above the discharge port to allow foreign substance in the supplied coating liquid to pass to the discharge port and to block waves in the supplied coating liquid from the bottom of the storage tank. In addition, the micro gravure coating device includes the coating liquid storage tank, and a micro gravure roll provided at an upper portion of the coating liquid storage tank and at least partially submerged in the coating liquid. Therefore, it is possible to effectively prevent floating matters from being coated on a substrate.