Power supply circuit for cable comprehensive test

The invention discloses a power supply circuit for a cable comprehensive test. The power supply circuit comprises a negative polarity high-voltage power supply circuit which comprises a first adjustable high-frequency alternating-current power supply, a first high-frequency high-voltage transformer, a first resistor group, a first capacitor group, a first light-operated semiconductor switch group and a first high-voltage silicon stack group; the positive polarity high-voltage power supply circuit comprises a second adjustable high-frequency alternating-current power supply, a second high-frequency high-voltage transformer, a second resistor group, a second capacitor group, a second light-operated semiconductor switch group and a second high-voltage silicon stack group; the voltage-dividing coupling unit comprises a third resistor group and a third capacitor group; the dielectric loss measuring unit comprises a divider resistor group, a current transformer, an acquisition card and an industrial personal comput