Switching power supplies are widely used in fields such as communication, healthcare, and industrial automation due to their advantages of high efficiency, reliability, and miniaturization. However, in a strong electromagnetic interference environment, switching power supplies have experienced faults such as short circuits, open circuits, and voltage losses, leading to the loss of control, strikes, and even burning of our electrical equipment. This has brought considerable challenges and losses to our production, life, scientific research, and learning. This article explores the impact of strong electromagnetic interference environments on switching power supplies by studying their working principles and magnetic component characteristics. It focuses on analyzing the loss mechanism of magnetic components and electromagnetic compatibility issues, and proposes improved design solutions such as the application of soft switching technology and compensation control. Finally, relevant voltage, current, temperature, and magnetic field strength data before and after improvement were obtained through experimental methods. The experimental results show that the improved switching power supply exhibits better performance and reliability in strong electromagnetic interference environments, providing a reference for the reliability research and application of electrical equipment in strong electromagnetic interference environments.