The article discusses a comprehensive project course for sophomore and junior undergraduate students. This course takes campus security as the background and guides students to integrate cloud computing, Internet of Things and mobile application technologies into the security field to build a set of cloud-edge-based security system. The project covers the design and implementation of cloud platforms, edge devices and mobile terminals. The cloud platform is responsible for data storage, analysis and management, including user management, device management, video monitoring and other functions. Edge devices use Raspberry Pi for real-time data processing and decision-making, and connect to terminal devices such as cameras, temperature and humidity sensors, and servos. In addition, a mobile application is developed using WeChat Mini Program to provide users with a convenient usage experience. During the implementation of the project, complex engineering issues such as multi-terminal system data interaction and face recognition driving the steering gear to open and close doors are solved. Furthermore, the article discusses key issues such as data encryption and access control from multiple dimensions, ensuring system security and privacy protection. Through the design and implementation of this comprehensive project course, students’ practical abilities have been enhanced, leading to a deeper understanding and application of cloud-edge technologies.