The invention provides a driving isolation power supply for a press connected IGBT. The driving isolation power supply for the press connected IGBT comprises a high potential energy self acquiring circuit, a PWM control circuit and a main circuit; the main circuit comprises a flyback isolation transformer, a switch circuit and an active clamp circuit; the high potential energy self acquiring circuit supply power to the PWM control circuit and the main circuit; the PWM control circuit outputs two PWM signals, wherein one PWM signal is connected to the switch circuit, and the other PWM signal is connected to the active clamp circuit, and finally, the simple and reliable driving isolation power supply is provided for the press connected IGBT. The driving isolation power supply for the press connected IGBT provided by the invention adopts the method of combining the function and the performance, therefore, the design of the parameters is more accurate, and the performance is further improved; and the current density of the wire is equivalent to the current density of the silicon rubber installation line, therefore, the structure design of the driving isolation power supply for the press connected IGBT is greatly simplified, and the use is convenient and efficient.