The invention discloses an insulation test device for a power electronic device. The power electronic device comprises a single chip, a sub-module and an integrated module. The test device comprises acavity sealing shell, a controller base and an internal fixture; the cavity sealing shell provides a sealed working environment for the power electronic device; the internal fixture clamps the powerelectronic device; the internal fixture is disposed inside the cavity sealing shell; the internal fixture is used for providing the power electronic device with voltage, temperature, and pressure; andthe controller base is connected with the cavity sealing shell and the internal fixture; and the controller base is used for controlling the working environment of the cavity sealing shell and the voltage, temperature, and pressure provided by the internal fixture for the power electronic device. With the insulation test device for the power electronic device of the invention adopted, the opticalsignals and electrical signals of the power electronic device in a high-temperature and high-pressure working environment can be measured.