The utility model relates to a drainage operating system for a concentration tank, which comprises a concentration tank, a sewage tank and an accident tank, wherein the concentration tank is communicated with a ceramic machine through a sliding chute; the sliding chute is positioned above the concentration tank and the sewage tank; an overflowing pipe is arranged between the sliding chute and the sewage tank, and a first valve is arranged on the overflowing pipe; the sliding chute is provided with a second valve or a sand bag, and the second valve or the sand bag is positioned below the connecting part of the sliding chute and the overflowing pipe; the underflow pump of the concentration machine in the concentration tank is used for pumping the ore pulp in the concentration tank into the sliding chute, and the ore pulp in the sliding chute enters the overflowing pipe, the sewage tank and the accident tank successively. In the utility model, after the underflow pump of the concentration tank is used for conveying the ore pulp in the concentration tank into the sliding chute with great diameter, the ore pulp in the sliding chute rapidly flows into the sewage tank and the accident tank again through the overflowing pipe easily; therefore, the drainage time of the concentration tank is shortened, the work efficiency is improved, and the manpower cost is reduced.