The invention is applicable to the field of industrial feeding devices, and provides a liquid quantitative feeding device. The leftmost end position and the rightmost end position of a propeller during moving are limited correspondingly by arranging a left set of magnet limiting rings and a right set of magnet limiting rings, when charging is needed, a motor drives the propeller to move from the rightmost end to the leftmost end, one-time quantitative feeding operation is completed, liquid feeding volume is the middle volume when the propeller is located at the leftmost end position and the rightmost end position, thus, quantitative charging operation is achieved, errors are avoided, automatic continuous quantitative feeding operation can be achieved by conducting timing rotating reversingsetting on the driving motor, the production efficiency is remarkably improved, and later maintenance is convenient and low in cost.