The invention provides an isolation switch automatic control method based on vector control, which comprises a motor controlling an isolation switch moving contact to rotate, a feedback unit, a main control unit, a driving unit and an IPM power unit. The main control unit receives the motor rotation speed and rotation angle displacement signals and motor operation current sampling signals fed backby the feedback unit, processes a motor control command by adopting a motor vector control algorithm with speed feedback, and generates a PWM modulation waveform of vector control; the driving unit carries out electrical conversion on the PWM modulation waveform generated by the main control unit, inputs the PWM modulation waveform into the IPM power unit, generates a three-phase PWM voltage andprovides the three-phase PWM voltage for the motor. The operation position of the isolation switch moving contact is accurately dragged, so that the isolation switch moving contact accelerates to moveat a position close to the static contact during switching-off and switching-on, an area where an electric arc is easy to generate is quickly crossed, the contact is effectively prevented from beingburnt, serious electrical accidents are further prevented, and the personal and equipment safety of operators is guaranteed.