The invention relates to a liquid supply device, in particular to a convenient box type device capable of controlling the liquid supply quantity and the liquid supply speed. The device has the function of storing liquid objects like the existing liquid supply equipment and can also be used for precisely guiding out the stored liquid objects in the unit time at the specific flow rate and the specific speed, and the use function and the application range of the liquid supply equipment are expanded. The device consists of twenty two kinds of parts including an anti-leakage gasket, a valve ball, a tube sleeve separation plate, a quantity control knob, a tube sleeve piston, a container box body, a conical inner cap and the like, a quantity control module and a current limitation module are formed, the liquid supply device has the characteristics that the quantity control is precise, the double pumping effect is realized, the precise current limitation is realized, the green low-carbon effect is realized, the automatic program setting is favorably realized, the applicability is wide, and the like, in addition, the implementation is simple, the manufacture is simple and easy, the formed products are attractive and elegant, the use is fast and convenient, and wide application prospects and wide market spaces are realized.