Abstract: Rock burst threatens the mine safety production and personnel safety. To evaluate the coal mine rock burst grade scientifically and rationally, based on the current situation of coal mine rock burst, the comprehensive evaluation index system of coal mine rock burst risk is introduced, which takes geological factors, safety management factors, mining technology factors and other factors as the criterion layer and 24 indexes such as mining depth and mechanical properties of coal and rock as the index layer; entropy weight method is introduced into the extension theory, and a new method of rock burst evaluation is proposed, which is the entropy-weight and matter-element extension model, and the new method is used to evaluate the rock burst grade in a coal mine. According to the engineering practice, the level of rock burst in the coal mine is “safety” grade, and the evaluation result is consistent with the actual engineering. The results show that the entropy-weight and matter-element extension model can better evaluate the rock burst, and the result of evaluation is accurate and reasonable.