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During the wireless charging process of autonomous underwater vehicle(AUV), the equivalent impedance of the battery changes continuously and the mutual inductance changes caused by the water impact, which seriously affects the transmission power and efficiency of the wireless energy transmission system. Therefore, a design scheme of data transmission system based on wireless power supply was proposed. The system achieves the communication function of the primary and secondary sides, forms a closed-loop control of the wireless energy transmission process to ensure a smooth and efficient charging process. System use the dsPIC30f4012 chip to generate a complementary square wave signal of varying frequency, driving the inverter to generate a modulated energy signal. In addition, the reliability of energy transmission and data transmission is considered comprehensively, and the system parameters are optimized. Error correction and synchronization mechanisms have been added to the data encoding to improve transmission accuracy. Completed the hardware experimental platform, verified the feasibility of the system, and tested the performance indicators of the system under different conditions. Experiment results indicate that the system symbol error rate maintains at stable 0% under the SNR of 0dB, which meets the practical application requirements.