Automatic water quality sampler

The utility model provides an automatic water quality sampler which comprises a cabinet body, and the cabinet body is internally provided with a sample reserving mechanism on which a plurality of sample reserving bottles are placed; the rocker arm mechanism is used for injecting the water sample obtained by the sampling mechanism into the sample reserving bottle; the sampling mechanism is used for sampling sewage at the discharge outlet, and the sampling mechanism comprises a water sample barrel group for storing a water sample; the water pressure sensor is arranged in the water sample barrel group and is used for detecting the water pressure condition in the water sample barrel group; and the drainage mechanism is arranged above the rocker arm mechanism, is communicated with the sampling mechanism, is electrically connected with the water pressure sensor, and is used for discharging redundant water samples in the water sample barrel group. The device is simple in structure, and the water quality of a dischar