The invention relates to a high-efficiency acid discharge system of a storage battery. The high-efficiency acid discharge system is used for acid discharge of a gel battery in a lead-acid battery after charging. The high-efficiency acid discharge system comprises multiple lead-acid batteries needing acid discharge. Connectors are uniformly inserted into the lead-acid batteries. Each one of the connectors comprises an acid suction pipe and an air inlet pipe; a tail end of the acid suction pipe is located at the internal bottom of the lead-acid battery; a tail end of the air inlet pipe is located at an internal upper part of the lead-acid battery; a top end of the acid suction pipe passes through an outlet liquid acid-resistant pipe and is connected to a negative pressure distribution pipe; an outlet end of the negative pressure distribution pipe is located at the bottom of the interior of a negative pressure acid storage tank; the top of the negative pressure acid storage tank is connected to a vacuum-pumping device by a vacuum connection pipe; the top of the air inlet pipe passes through an inlet air acid-resistant pipe and is connected to a positive pressure distribution pipe; and the positive pressure distribution pipe is connected to an air compressor. The high-efficiency acid discharge system of a storage battery utilizes the principle of simultaneous carrying out negative pressure acid suction and discharge, and positive pressure acid suction and discharge, has high acid discharge efficiency, a low rejection rate and strong environment protection effects, and realizes secondary utilization of discharged acid liquid.