Abstract: It is an important relationship between enterprise safety investment and safety management level.In order to dynamically reflect the safety management level of enterprises, this paper uses the theory and method of system dynamics to construct the causal feedback diagram and system flow chart of safety investment and safety management level.Based on the weight of the evaluation index obtained by AHP, takes Changzhou Xiyuan Sewage Treatment Co., Ltd.as an example, and uses Vensimple software to simulate.The experimental results show that the SD model of enterprise safety management can quantitatively predict the development trend of enterprise safety management level; the best investment scheme can be determined by adjusting the investment proportion of each subsystem of enterprise safety management, which provides the basis for enterprise safety investment decision.