Abstract: As channels for exchanging energy between high-power microwave systems and the outside world, the high-power microwave antennas have a significant impact on the performance of high-power microwave systems. When the high-power microwave antennas are designed, it is difficult to analyze the performance of high-power microwave antennas through experimental methods, since the measurement methods are limited and the experimental costs are high. Compared to experimental methods, efficient and accurate electromagnetic simulation methods are the most effective and economical research means to analyze the performance of high-power microwave antennas. At present, the mainstream electromagnetic simulation methods for high-power microwave antennas include full wave simulation methods, high-frequency asymptotic methods and hybrid methods. This paper introduces the new progress of electromagnetic simulation methods for high-power microwave antennas in recent years, summarizes the advantages and disadvantages of electromagnetic simulation methods, and provides ideas for the selection of simulation methods for high-power microwave antennas.