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The current launch vehicle pressurization system adopts mechanical control method, which is difficult for debugging and measurement error controlling. Therefore an electronic controller is proposed based on triple modular redundancy. There are three processing units for pressure data acquisition and processing. In each unit, tank pressure is measured by a digital sensor, and then transmitted to microcontroller. The data collected is handled by digital filters and intelligent interpretation to control the hardware voter. The control of electromagnetic is obtained by the two-out-of-three strategy. Through testing, the controller has good performance in debugging and testing, and the pressure accuracy is within 1%. The controller completed the prototype, and has high universality and reliability.