The invention relates to a linear high voltage direct current stabilized power supply with an IGBT as a pass transistor. The power supply is composed of a high voltage boosting transformer, a high voltage rectification filter circuit, a series-connection IGBT voltage regulating circuit, an automatic current limiting circuit, an output voltage filter circuit, a potential holding circuit, an output voltage feedback circuit, an operational amplifier comparator circuit, a zero setting circuit and a set signal linear isolating circuit, wherein the high voltage boosting transformer, the high voltage rectification filter circuit, the series-connection IGBT voltage regulating circuit, the automatic current limiting circuit, the output voltage filter circuit and the potential holding circuit are sequentially connected to form a main circuit, and the output voltage feedback circuit, the operational amplifier comparator circuit, the zero setting circuit and the set signal linear isolating circuit form a control circuit. The linear high voltage direct current stabilized power supply is used for high voltage IGBT device VCES tests, working voltage can reach 10 kV, voltage output can be linearly set and controlled through a computer, voltage output is stable and free of high frequency noise, and direct current square waves with the adjustable width can be obtained through control as needed.