Ink box capable of supplying ink externally

The utility model discloses an external ink supply ink box which comprises an ink box body, the ink box body is installed inside a printer shell, an ink adding opening is formed in the ink box body, an installation frame is arranged at the bottom of the ink box body in a threaded connection mode, the end portion of the installation frame is connected to the inner wall of the printer shell in a threaded connection mode, and meanwhile an ink adding pipe is fixedly arranged at the ink adding opening in the ink box body. The end, away from the ink box body, of the ink adding pipe communicates with the ink supply nozzle. A communicating pipe and a mounting assembly thereof are mounted on the bottom right side of the ink box According to the ink box with the external ink supply function, whether ink shortage exists in the ink box body or not is observed by observing the height of the ink in the vertical communicating pipe, when ink needs to be added into the ink box body, the plug is detached, ink is injected into