Abstract: Submarine cables for offshore wind power are regarded as lifeline of offshore wind power systems, with their operation and maintenance (O&M) technology directly determining the safety, reliability, and economic performance of wind farms. Domestic and international research progress since 2020 in submarine cable O&M technologies, condition monitoring systems, as well as system integration and optimization was systematically reviewed. Furthermore, a comprehensive evaluation framework covering O&M costs, techno-economic performance, and lifecycle risks was established, clarifying the critical impact of O&M strategies on project economics. Finally, by comparing the differences in development routes, research priorities, data integration, and development stages of submarine cable O&M technologies for offshore wind farms at home and abroad, it was pointed out that at the current stage, China should pay attention to strengthen the coordinated development of mechanism, standard and system, while other countries should focus on overcoming bottlenecks in deep-sea engineering technology, so as to jointly promote the development of more reliable and efficient submarine cable O&M technologies.