The invention discloses an ink filling unit comprising a base table, a lower
bottle device, a lower iron bar device, a filling device, a lower connecting cover device, a lower inner cover device, a cover screwing device, a connecting cover aligning device, a cover detection device, a lower outer cover device, an outer cover pressing device, a
discharge device, a rotary disc, a
control system and a return detection device. The lower
bottle device, the lower iron bar device, the filling device, the lower connecting cover device, the lower inner cover device, the cover screwing device, the connecting cover aligning device, the cover detection device, the lower outer cover device, the outer cover pressing device and the
discharge device are distributed sequentially
clockwise in the circumferential direction of the rotary disc. A
turbine speed reducing motor is arranged at the bottom of the base table. A plurality of ink
bottle installing seats are distributed at the top of the rotary disc evenly in the circumferential direction. Through the ink filling unit, full
automation of ink filling is achieved, production efficiency and product quality are improved greatly, a large number of manpower resources are reduced, cost input is reduced, and good application and popularization value is achieved.