Water body silt content detecting system

The invention provides a water body silt content detecting system. The system comprises a first light source, a second light source, a first lens, a second lens, a first water body sampler, a second water body sampler, a spectrum detector and a main control unit. A first light beam given out by the first light source is concentrated by the first lens and then enters the first water body sampler, and the first light beam penetrates through a detected water sample in the first water body sampler to enter the spectrum detector. A second light beam given out by the second light source is concentrated by the second lens and then enters a light transmitting pipeline in the second water body sampler, and the second light beam penetrates out of the light transmitting pipeline and then enters the spectrum detector. The spectrum detector detects the received first light beam, so that a first detecting result is obtained; the spectrum detector detects the received second light beam, so that a second detecting result is obtained. The main control unit analyzes the first detecting result and the second detecting result, and accordingly the silt content of the detected water sample is obtained. By means of the water body silt content detecting system, the influence of interference light on the detecting results can be eliminated, and the silt content in a water body can be detected accurately.