The invention belongs to the field of simulation test systems and relates to an international thermonuclear experimental reactor (ITER) device probe volt-ampere characteristic simulation test system.The system comprises a voltage measuring unit; the voltage measuring unit collects voltage signals and sends the voltage signals to a PID control unit; the voltage signals are compared with a specified output voltage; specified output current is obtained through the PID control unit on the basis of a volt-ampere characteristic curve table; the specified current is compared with output port currentsignals obtained by a current measuring unit; a PI control unit and a carrier phase shift PWM unit can generate pulses for controlling all H-bridges; and the pulses can control an H-bridge input unit, pass through a bi-directional isolation DC/DC unit and an H-bridge cascade output unit, and are connected in series with a low-voltage linear power source through an LCL filtering unit, so that probe power source testing and joint debugging can be realized according to preset volt-ampere characteristic curve table parameters. The success rate and efficiency of the system during the device testing of a tokamak device can be greatly improved.