Abstract: Aiming at the problems of incomplete coverage of monitoring points and low intelligent level of karst water disaster of coal mining in Northern China-Type coalfields,on the basis of the theory of “Down Three Zones”,a comprehensive monitoring and early-warning technical method was proposed,which is composed of the multi-frequency continuous electricity method monitoring source of water-inflow, and “ tunnel-ground-borehole” joint micro-seismic technology monitoring of water filling channel during mining,and the intelligent early warning technology of water dis- aster based on monitoring data. Among them,the multi frequency continuous electrical method monitoring system takes the pseudo-random multi-frequency series as the artificial field source,uses the multi-frequency series and other detec- tion technologies to extract the weak signal in the strong noise background,and uses the quasi Gauss-Newton method to carry on the full space three-dimensional resistivity inversion to the pre-processing data,so as to realize the automation and three-dimensional monitoring of change process of the water inflow. The “roadway-ground-borehole” joint micro- seismic monitoring system is mainly based on the three-dimensional deployment of sensors and recovery devices in the borehole,the underground wired (IEEE1588) and ground wireless (GPS) time synchronization method is used to re- alize the synchronization of ground and underground data collection time,then the real-time transmission network of monitoring data is established,and the three-component positioning calculation based on polarization analysis joint in- version is carried out. The method realizes the accurate location of the fracture position of the water conducted chan- nel,solves the problems of the precise location and the real-time monitoring of the water inrush channel. The intelligent early warning system uses the time series big data mining technology and the computer deep learning technology to an- alyze and process the massive monitoring data from electricity and micro-seismic,and uses the index early warning and the model early warning method to predict the spatial distribution of the monitoring data and the real-time danger lev- el. Finally,the paper took the 11916 coal face of the Gequan coal mine as the application site,and adopted multi-fre- quency continuous electrical monitoring system,“ roadway-ground-borehole” combined micro-seismic monitoring sys- tem and intelligent early warning system to carry out three-dimensional monitoring and intelligent early warning for the karst water damage in the coal seam floor. The study results provides a technical and equipment support for the monito- ring and early warning of coal seam floor water hazard.