The invention discloses a high-voltage electrostatic discharge apparatus for an antistatic capability test of a power purchase card. The apparatus comprises a high-voltage power supply, the high-voltage power supply is connected with a static discharger, the high-voltage power supply is successively connected with an energy storage capacitor, a high-voltage sampling circuit and a D/A circuit, the D/A circuit is connected with a PLC, and the PLC is connected with a touch screen; the PLC is connected with the high-voltage power supply through an A/D circuit; and the PLC is internally provided with a voltage generation unit, adjusting voltages are generated through a linear function curve, and the adjusting voltages are sent to the high-voltage power supply through the A/D circuit. High-voltage output of the apparatus employs high-voltage grading type compensation, the problem of low high-voltage output precision is solved, the precision is higher than 3%, and it is ensured that test voltages can reach a standard requirement level.