This work aimed to invent a liquid filling valve that does not drip after closing. Breaking the traditional design concept, the filling valve was designed to be composed of two cavities, the filling cavity and the negative suction cavity, and the negative suction cavity was within the filling cavity. At the moment of closing the filling valve, upper cavity and lower cavity were formed in the negative suction cavity. The lower cavity had a negative pressure, which could automatically suck the residual liquid into the negative suction lower cavity along the valve-core and the slender hole in the middle of the negative suction valve-stem. The filling valve did not drip the liquid after closing, avoiding pollution of the packaging bottles by the residual liquid, and there was no need to install the traditional liquid collecting plate or the complicated negative suction device. Liquid filling valve with negative suction function was successful in solving the problem of filling valve dripping. In addition, the filling valve had compact structure and low manufacturing cost.