Refined operation, maintenance and management are mainly realized by regulating sluices, weir gates and isolating water-stop gates installed in each process section. By slightly adjusting the gate opening, the sewage flow of each process including inflow, sedimentation, biochemical treatment and effluent discharge can be accurately balanced to stabilize the treatment load and prevent impact on treatment procedures caused by water volume fluctuation. Meanwhile, water-stop gates are adopted for quick section isolation, flow interception and water cutoff, facilitating equipment maintenance and fault isolation, so as to effectively guarantee the continuous, safe, efficient and stable operation of the whole sewage treatment system.