Abstract: In order to improve hydrological monitoring of coal mine groundwater and water disaster prediction level, a real-time tracking monitoring and early warning system for coal mine groundwater based on intelligent water level meter was designed. The system uses metal probes of a water sensor to judge whether the intelligent water level meter is in aquifer, and downs the intelligent water level meter into water automatically when water level drops below the intelligent water lever meter, so as to avoid pseudo data. The system obtains water pressure data through a hydraulic sensor, and uses upper computer to fit and analyze the data, so as to calculate water level. The test results show that the system can run stably and early warn water level mutation of aquifer in 5 s, whose measurement error of water level is not more than 2 cm.