Water quality analysis system

The utility model relates to the technical field of water quality analysis, in particular to a water quality analysis system which comprises a pool body and a sampling assembly, the pool body is provided with a water containing cavity and a sampling cavity, the sampling assembly comprises a water guide pipe, an electric control water valve and a sampling vessel, and the water guide pipe, the electric control water valve and the sampling vessel are all arranged in the sampling cavity. A water outlet is formed in the inner wall of the water containing cavity, one end of the water guide pipe is fixedly arranged at the water outlet and communicated with the water containing cavity, the other end of the water guide pipe is arranged above the sampling vessel, and the electric control water valve is arranged on the water guide pipe and used for controlling sewage in the water containing cavity to be guided to the sampling vessel. According to the sewage treatment device, sewage in the sewage pool can be obtained, so