The chlorophyll and turbidity sensor uses fluorescence method and light scattering method to measure the concentration of chlorophyll and turbidity in water. The sensor uses an integrated three-optical probe design and signal processing consists of three parts, which can simultaneously detect seawater chlorophyll concentration, turbidity concentration and temperature, which can automatically correct the effects of low turbidity and chlorophyll concentration when temperature changes. In addition, the sensor is equipped with mechanical brushes, effectively prevent biological adhesion.