Abstract: Welding power supply system with high performance is the key to meet the requirement of pulse welding technology, which can generate accurate welding arc and high welding quality.First, the system design program was proposed for fully digital pulse inverter welding power supply, including the main circuit structure and hardware circuit of the control system, based on field programmable gate array and 32-bit micro-control unit.Second, the software design for the main control system was described using very high-speed integrated circuit hardware description language to realize the complex pulse welding technology sequence and steady arc control.Effective methods were investigated to improve the anti-interference capability and real-time performance of the system.Finally, the experiments were conducted, and the results showed that the designed fully digital intelligent pulse arc welding power source had high flexibility, robustness and reliability, which could satisfy rigorous demand of the welding arc so as to achieve satisfactory welding quality.