Abstract: Due to the phase angle difference between high-voltage dual power sources, it is difficult to ensure the smooth and fast power switching process. Therefore, an adaptive control method for the entire process of automatic switching of high-voltage dual power sources is studied. Collect the current and voltage signals of the high-voltage dual power supply, and design an adaptive control strategy based on anti parallel thyristors, which controls the automatic switching of the entire process of the high-voltage dual power supply by adjusting the conduction angle of the anti parallel thyristors. The experimental results show that when a three-phase voltage drop fault occurs in the main power supply, the design method only needs 2.5 ms to achieve automatic switching of the backup power supply, proving that this method has good adaptability in the entire process control of automatic switching of high-voltage dual power supplies and can be further promoted in this field.