The utility model relates to a liquid dispensing device for medical use, which comprises a flexible needle tube body. The two ends of the flexible needle tube body are respectively provided with a hard needle tube end, wherein one end of the hard needle tube end is connected with a suction tube. The other end of the hard needle tube end is connected with an injection tube. The other end of the suction tube is connected with a suction syringe needle while the other end of the injection tube is connected with an injection syringe needle. The suction tube and the injection tube are respectively provided with a check valve. In a liquid dispensing process, the suction syringe needle is first inserted into a liquid medicine bottle while the injection syringe needle is inserted into an infusion bottle. Then the flexible needle tube body is pressed. The liquid medicine is sucked from the suction tube into the flexible needle tube body under the influence of check valve. Again the flexible needle tube body is pressed. The liquid medicine sucked into the flexible needle tube body first passes through a filtering membrane and then is injected from the injection tube into the infusion bottle. The liquid medicine is free of pollution during the whole liquid dispensing process. Meanwhile, the liquid medicine injected into the infusion bottle will contain no impurities due to the filtering membrane for filtration. Furthermore, the utility model which is simple in operation, labor-saving and time-saving reduces the labor input of the nursing personnel.