This study addresses the complexity and integration challenges in the design and validation of avionics systems for amphibious aircraft by developing a comprehensive verification device based on modular design. Through system requirements analysis, key functions and performance criteria were identified, leading to the design and implementation of subsystems supporting ARINC429 and ARINC664 aviation interface standards. Additionally, comprehensive testing equipment, wiring matrices, and power management systems were developed. The findings indicate that this verification device excels in data stimulation and acquisition, automated testing, and configuration management, effectively simulating and testing various operational scenarios of avionics systems. The automated testing capabilities are particularly optimized to accommodate rapid technological advancements, while the modular design enhances testing efficiency, ensuring swift adaptability and integration in practical applications. This research successfully developed an avionics system comprehensive verification device, significantly improving the quality and speed of design and validation, laying a solid foundation for further advancements in avionics systems, and showcasing the powerful advantages of modular design in avionics system development.