The invention relates to a medical liquid transferring device, comprising a hollow liquid transferring device body, a joystick and a sealing head, wherein the liquid transferring device body is sequentially provided with an upper tapered plug, an outer sleeve, an inner sleeve, a middle liquid storage segment and a lower tapered plug from top to bottom, the upper tapered plug is provided with a liquid inlet, the lower tapered plug is provided with a liquid outlet, the upper tapered plug is connected with the outer sleeve, the inner wall of the outer sleeve is connected with a lower seal ring, the outer wall of the inner sleeve is connected with an upper seal ring positioned above the lower seal ring, the inner sleeve is sheathed in the outer sleeve, the upper seal ring and the lower seal ring are positioned between the inner sleeve and the outer sleeve, the inner sleeve is connected with the middle liquid storage segment, the middle liquid storage segment is connected with the lower tapered plug, the joystick is connected with the seal head and positioned in the liquid transferring device body, and the joystick is connected on an inner wall at the top end of the outer sleeve through a connecting rod. The medical liquid transferring device is easy to operate and high in liquid transferring speed, can relieve the workload of the staff engaged in medical care, and improves the work efficiency.