The invention discloses a coal mine geological risk early warning method, device and system based on a multi-source fusion technology, and the method comprises the steps: obtaining basic geological data obtained through a geophysical exploration technology, and constructing an initial geological model based on the basic geological data; real-time geological data obtained along with detection in the mining process and real-time sensing data collected by the sensors corresponding to all the areas are obtained; based on the real-time geological data and the real-time sensing data, dynamically updating the initial geological model to obtain a dynamic geological model; and obtaining a coal mine geological risk assessment value based on the geological type corresponding to the dynamic geological model and the real-time sensing data, and carrying out coal mine geological risk early warning according to the coal mine geological risk assessment value, so that the accuracy and robustness of dynamic geological model fusion can be improved by utilizing a multi-source data fusion technology. And reliable risk early warning is carried out according to the accurate dynamic geologic model.