Sewage treatment plant effluent quality detection and evaluation method and water quality detection system

The invention discloses a sewage treatment plant effluent quality detection and evaluation method and a water quality detection system, the water quality detection system comprises a water quality detection system, the water quality detection system comprises a water quality detection buoy for detecting the effluent quality of a sewage treatment plant and a high-precision homogeneous water quality detector; the water quality detection buoy comprises a floating body, a floating rod, a first water quality detection sensor and an anti-grounding protection component; the high-precision homogeneous water quality detector comprises a detection box, a screw rod, a shaft moving part and a water quality detection sensor group, the water quality detection buoy is placed in sewage for water quality detection, the high-precision homogeneous water quality detector performs water quality detection by adopting a mode of injecting the sewage, then water quality detection results of the water quality detection buoy and the hi