The utility model relates to a three way valve for the jet printer. The three way valve consists of body of the valve with three openings and a valve core inside the valve body. The three channels in the valve body are respectively a No.1, a No.2, and a No.3 channels that are on the same surface; wherein, the No.1 and the No.2 pipes center lines overlap and the No.3 pipe extents out of the valve core and is arranged upright on the other two pipes. The valve core is in the shape of a cylinder which has three vertical holes that are mutually connected in the center, and is connected with the valve handle. The valve body is of round tube, and the center line of the round tube is vertical to the three pipes center lines, and the valve handle is marked with the angles of the valve core. The utility model compared with the prior technology adopts the three way valves and changes the pipes route via the rotation of the handle. When in the normal working condition, the ink box is communicated with the external ink bottle, and the ink from the ink box continually flows into the ink box, and whereas in moving, the connection between the ink box and the ink bottle is cut out.