As wireless charging systems become more and more widely used, higher requirements are put forward for their information interaction. Traditional external communication devices have problems with high delay and safety. Wireless power and data transfer technology can realize the synchronous transfer of power and data without additional communication device. This paper builds a simultaneous wireless power and data transfer (SWPDT) system for electric vehicles. It uses a single transmitting coil and discrete receiving coils to construct different power and data transfer channels. By changing the duty cycle of the inverter, the data is modulated into the system. Moreover, the system is modeled to analyze the power and efficiency of the power transmission and the extraction voltage of the data channel. Finally, a simulation model is built to verify the reliability and accuracy of the system. The results show that the power and data rate achieves 1.5kW and 16kbps respectively. The influence of high power transmission on communication is reduced and simultaneous transmission of high power and information without additional communication devices is realized in this paper, which is beneficial to reduce the cost.