Abstract: User mobility is a major feature of wireless networks. At present, the research on physical layer security rarely considers the impact of user mobility on communication security performance. This paper studies the physical layer security mechanism of cooperative jamming for random mobile users, derives the ergodic security capacity under cooperative jamming in random mobile scenarios, and compares it with the cooperative jamming scheme in static scenarios. The influence of specific parameters on the security performance is clearly revealed by strict mathematical proof. Numerical results show that the ergodic security capacity and secure energy efficiency (EE) of the cooperative jamming scheme in random mobile scenarios are improved, and the transmission security is enhanced.