Abstract: In response to prevalent issues in the experimental teaching of communication engineering, such as emphasis on verification over system-level design, focus on knowledge over competency, and fragmentation of inter-university resources, this study, guided by the concepts of Emerging Engineering Education and engineering education accreditation, proposes and constructs a hierarchical, progressive system-level experimental teaching system along with an inter-university co-construction and sharing mechanism. It emphasizes a paradigm shift from knowledge transmission to competency generation, focusing on cultivating system-design of students and prototype-implementation abilities to solve complex engineering problems. It designs a four-level experimental pathway of “virtual simulation → software simulation → semi-physical → full-physical” to accommodate students' personalized development needs, and clarifies the corresponding experimental types (verification, comprehensive design, research exploration), ability cultivation objectives, technical means, and teaching methods for each level. Furthermore, the research explores a new collaborative model involving high-level research universities, local research universities, and application-oriented universities, characterized by “platform co-construction, content co-creation, and resource sharing”, aiming to break down inter-university barriers and revitalize experimental teaching resources. This paper elaborates on the theoretical foundation, architectural design, platform construction, content innovation, hierarchical evaluation, and mechanism guarantees of this system. In terms of preliminary practical foundation, university of electronic science and technology of China has completed the stage construction of the space-air-ground integrated information system experimental platform relying on a 4-million-yuan equipment renewal project, and its “Honghu Plan” has cultivated three cohorts of students with proven achievements; southwest university of science and technology has developed 19 system-level experimental teaching cases; chengdu technological university has put 8 sets of software-defined radio equipment into teaching work. The tri-university alliance has a solid practical groundwork. Its innovation and feasibility are demonstrated through preliminary practical foundations and literature comparison, aiming to provide a replicable paradigm for the reform of practical teaching in communication engineering and the construction of regional teaching alliances in China.