Abstract: The design method is put forward for the high-precision turbidity sensor in　underground　coal mine, and the software and hardware design of turbidity sensor are mainly introduced. The sensor adopts the integrated circuit design such as the imported photodiode and high-precision operational amplifier. The measurement curve is fitted by MATLAB software tool, and the measurement data is corrected and compensated, which greatly improves the measurement accuracy of the sensor and reduces the measurement error. The sensor uses the low-power design, especially the OLED display technology replaces the traditional digital tube or LCD liquid crystal. In terms of digital interface communication design, the anti-interference design is adopted, and through the EMC test, the results show that the sensor is very suitable for the complex electromagnetic environment in underground coal mine.