Abstract: In order to achieve quick identification of mine water bursting source and flood forecasting, an ion potentiometer used for water quality analysis was designed. The ion potentiometer uses ion selective electrode to transfer corresponding ion in water sample to voltage, and the voltage is amplified by signal conversion circuit and converted to digital value by 24 bit high-precision AD converter. Finally the ion potentiometer uses TFT LCD screen to display ion species, ion concentration and other related information, and it has high measurement accuracy of ion content and is easy to use.