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In order to meet the diversified requirements of different services in the high-speed rail networks, such as bandwidth, delay, and reliability, a multi-dimensional resource adaptation architecture of high-speed rail networks based on Software-Defined Networking (SDN) and Multi-access Edge Computing (MEC) is proposed. It adopts the key technologies and methods of SDN logic centralized control and MEC, and designs core functional components on three entities embedded in the SDN controller, MEC server and software-defined mobile unit. It realizes real-time collection of link state information, dynamic adaptation of multi-dimensional network resources, and timely response to services. Through a practical high-speed rail network application case test, the performance improvement of the architecture in terms of reliability, delay and resource utilization is verified. Finally, some future problems and research directions of the architecture are discussed.