The utility model discloses a
nitrate concentration detection device with an automatic
water sample filtering function, which comprises a shell immersed in water, a filter is arranged on the left side of the shell, a connector is arranged on the right side of the shell, and the filter is communicated with the connector through a
water channel arranged in the shell in a left-right extending manner. The connector is connected with a water ejector
assembly used for enabling a
water sample to enter and exit from the
water channel, a light channel used for allowing light to pass through is arranged in the shell in a front-back extending mode and penetrates through the
water channel, and light-transmitting plugs are arranged on the two sides, making contact with the water channel, of the light channel. A
receiver used for receiving light
waves is arranged at the front end of the light channel, and a
light source used for alternately emitting dual-
wavelength light is arranged at the rear end of the light channel. According to the water
injector assembly, a
water sample enters the water channel through the filter to be detected, that is, the water sample can be automatically filtered during detection, so that the influence of
turbidity and
suspended solids on a detection result can be eliminated, and large errors are avoided.