Arc welding power source is more and more widely used in modern welding field Aiming at the problems of droplet splashing and large switching loss existing in traditional arc welding power supply, this paper takes the hot arc welding power supply based on LCC resonant circuit as the research object in recent years, analyzes the characteristics of the power supply by using the fundamental wave method and intermediate parameter method, and designs an arc welding power supply based on LCC resonant circuit Based on the analysis of the characteristics of inverter power supply based on LCC resonance, the characteristics of LCC resonance circuit under different parameters are analyzed and studied by MATLAB software, and the corresponding characteristic curves are drawn According to the selection principle of parameter optimization, the parameters of LCC resonant channel are optimized, and the main circuit parameters of arc welding power source are designed Pspice is used to simulate the main circuit of the power supply based on LCC resonance, and the influence of parameter changes on the characteristics of the power supply is further studied. The simulation results show that the design and optimization are reasonable and feasible On this basis, the experimental device of arc welding power source is built and the experiment is carried out The experimental results and analysis show that the designed arc welding power source has good load adaptability; When the power supply works, the LCC resonant channel is in inductive commutation, which realizes soft switching and reduces switching loss; The harmonic distortion rate of the output voltage is small, and the output voltage and current waveform are close to sinusoidal, which meets the design requirements The experimental results show that the design and optimization are feasible in engineering practice, and can improve the performance of arc welding power source