In order to solve the problem that the original equipment of the reservoir water supply system of Sanjiaohe Mine without the ability of judging the equipment failure, the equipment with low operating efficiency and high failure rate, the monitoring and control system for the inlet and outlet water system of the sewage treatment plant was installed, and the sensor selection, the sub-station and the main station were designed. The field application showed that the system design was reasonable, the operation was stable and the function got good result, the work efficiency was effectively improved, the equipment operation was safe and reliable, and the remote automatic control of the reservoir of the mine sewage treatment plant was realized.