The invention discloses a coal mine pressure bump predicting and forewarning method. The coal mine pressure bump predicting and forewarning method comprises the following steps that a micro shock monitoring system is established based on the outcome of the working face impact risk evaluation; whether periodicity of total energy peakof daily micro shock events exists is determined; abnormal peak days of daily micro shock events are divided; periodic interval of the total energy peak of the daily micro shock events is divided; peak periodic intervalis adjusted; total energy mean value of adjusted peak periodic interval is recalculated; peak day spacing range is determined; pressure bump forewarning is conducted; and forewarning index is continuously optimized until target working face stopping is completed. The method is accurate in peak periodic interval predicting, and based on combination with stress monitoring data, the method is an effective means for pressure bump forewarning; andcompared with a current common method of individual micro shock event forewarning, the method is more objective and accurate.