To conduct high parameter physics research, a long pulse switching power supply module and control system were developed to meet the power supply needs of pulse generator sets and power grids. By changing the wiring method of the AC terminal, the module power supply type can be switched. The built-in soft start circuit can reduce the impact of surge current on the power grid and switches during the module charging process. The module meets the design requirements for protection, driving, and status monitoring under two operating modes. The controller adopts a microcontroller and programmable logic gate array architecture, with both local and remote control functions. It implements soft start control and monitoring functions in microcontrollers by using integrated circuit bus to expand IO, reducing the complexity of data transmission links and systems; The control algorithm of the power supply is implemented in the programmable logic gate array, and the interface design of the photoelectric conversion box is unified through level signal conversion processing. The test results under the established testing conditions show that the module and control system design meet the requirements, and the power supply achieves 80 kV/100 s/20 A output parameter testing and protection experiment testing.