Abstract: Abstract: The advent of the fourth industrial revolution has spurred the rapid development of new technologies. While enjoying the convenience brought by the new technology, the public will have certain panic and resistance to the unknown risks caused by the emerging technology, which will be diffused through specific channels and generate the coupling effect of risk perception. Therefore, grasping the social contagion rule of emerging technology risk perception has great theoretical and practical significance for the governance of emerging technology risk. The concept of risk perception contagion coupling is defined, and the contagion mechanism of emerging technology risk perception in the social system is also analyzed based on the "coupling - evolution " process in this paper. Meanwhile, the social contagion quantitative model of risk perception is built. By using numerical simulation, the different impact of internal and external factors on the coupled effect and efficiency of emerging technology risk perception social contagion. The results show that with the increase and deepening of individual psychological distance to emerging technology risks and the degree of public participation in emerging technology risk governance, the superposition effect of risk perception contagion in the social system gradually weakens, the independent effect gradually increases, and the social contagion efficiency of risk perception gradually decreases. With the improvement of individuals' trust in information sources, the attraction effect of social contagion of risk perception becomes increasingly prominent.