Points are arranged between key nodes, including tributaries and main streams of the sewage network, to monitor the dynamics of upstream and downstream sewage in real time. The traditional manual sampling method cannot achieve one-hour interval monitoring, and because the points are all underground sewage networks, some points are in the middle of the road. Conventional online monitoring equipment faces problems such as a large footprint and difficulty in electricity use. Our sensor is compact and can be submerged in the monitoring well without requiring additional land space; it has low power consumption and can be powered by batteries. The data acquisition instrument is synchronously positioned in the monitoring well to address the issue of electricity consumption.