Abstract: New energy generation systems, such as wind power and solar power, pose many challenges to the stable operation of the power system due to their inherent intermittency and uncertainty. To address this issue, a reactive power compensation method for new energy power systems based on fuzzy theory is proposed. Firstly, complete the theoretical analysis of reactive power compensation device compensation. Then, based on this, design a fuzzy controller to control the reactive power compensation device and optimize its dynamic and static characteristics. Finally, apply the fuzzy controller to the reactive power compensation device to achieve fuzzy dynamic compensation adjustment of reactive power. The experimental results show that the reactive power compensation method for new energy power systems based on fuzzy theory is an effective and feasible technical solution, which not only improves power quality and system stability, but also has strong adaptability and robustness.