Extracting solution storage tank

The utility model relates to an extracting solution storage tank, which belongs to the technical field of pharmaceutical equipment. The extracting solution storage tank comprises a tank body, a liquidometer, a short neck, a feed inlet, a discharge outlet, a plus three-way valve, an adjustable bracket and a solution drain device, wherein the solution drain device is arranged at the bottom end of the tank body, and the solution drain device and the bottom end of the liquidometer are located in a same horizontal line. When the extracting solution storage tank releases liquid supernatant, the positions of corresponding valve ports at a solution absorbing part can be rotatablely adjusted according to the positon of the liquid supernatant displayed by the liquidometer so as to achieve an effect that the liquid supernatant is completely released, thereby omitting an operation of artificially observing the liquid level from the top of the tank, and avoiding the occurence of problems that liquid supernatant is release