The invention provides a method for predicting risk of mine underground stress under impact based on a coal rock power system and belongs to the technical field of coal mining. The method includes the steps of 1, analyzing historical events involving the underground stress under impact of a mine to be predicted so as to determine clinical energy; 2, using a microearthquake monitoring system for monitoring magnitudes and orientations of the microearthquake events which occurred in the mine to be predicted; 3, constructing a coal rock power system model according to earthquake source positions and energy values of high-energy microearthquake events; 4, predicting the risk of the underground stress under impact confronted by mining engineering when the underground stress under impact occurs according to a coal rock power system model region where the mining engineering is located. The method has the advantages that the coal rock power system model and regional scale computing methods are put forward, a corresponding relationship between all regions and the impact risk degree is established, and the impact risk degree within different scale ranges can be judged according to the coal rock power system model, so that bases can be provided for targeted prevention and management of the underground stress under impact of all mines.