Abstract: A fully digital hydraulic support control system architecture integrating 5G and dual CAN bus is proposed to address persistent challenges including fragmented communication protocols, information isolation, and interoperability barriers among devices. The system incorporates 5G communication and the Mining-Harmony MDTP protocol to achieve unified interoperability across equipment from multiple manufacturers. Heterogeneous networks — including CAN, 5G, and industrial Ethernet — are integrated under a common access framework, thereby supporting high-concurrency communication demands and enhancing network robustness. Coverage blind spots and high latency in underground environments are effectively mitigated, ensuring real-time transmission of control commands. A multi-channel communication architecture is established to enable high-speed inter-controller connectivity with inherent redundancy, eliminating single points of failure. Furthermore, a fully digital sensor network is implemented with standardized data interfaces, types, and transmission protocols. This supports automatic sensor adaptation and identification, as well as seamless integration with intelligent mining equipment and management systems. Controller-to-controller communication is realized via dual CAN buses, while 5G networks facilitate digital signal transmission between controllers, sensors, underground centralized control centers, and surface control centers. Industrial validation at the Daning Coal Mine in Shanxi Province demonstrates the following: in terms of real-time performance, end-to-end latency between a computer and a controller via wireless base stations remains stable at 104.08 ms for wireless links and 89.16 ms for wired-wireless hybrid paths, with a packet loss rate reduced to 0.1%. The MDTP protocol supports concurrent communication for over 200 devices within a single network, representing a 300% improvement over conventional solutions. Accurate synchronous control of support movements is maintained under challenging conditions, including strong electromagnetic interference, high pressure, humidity, and corrosion. System reliability is reflected in a mean time between failures (MTBF) exceeding 5000 hours, significantly surpassing industry standards. In the event of Ethernet link failure, seamless failover to 5G communication is achieved without operational interruption. The system enables several representative 5G+Mining-Harmony application scenarios, such as automated hydraulic support tracking, working face digital twin, and predictive maintenance, providing a reusable communication framework for intelligent mine construction.