The traditional power safety training methods are difficult to achieve a good training effect. In this paper, an entity emulation system for power safety training based on the three-dimensional stereo vision and the wireless communication technology is presented. A real-time 3D motion capture unit based on stereo vision is used to acquire the space position of markers fixed on the power equipment emulators and on the clothes of training personnels to monitor the status of power equipment emulators and recognize the action behaviors of training personnels. Wireless network modules are used to transmit device status monitoring data from the power equipment emulators to the main computer, and to transmit control signals from the main computer to the power equipment emulators to simulate the device failure phenomenon in case of misoperation. The proposed entity emulation system can provide an effective, realistic and immersive training environment for power system personnel training.