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The development and utilization of marine renewable energy is one of the most important measures to solve the energy crisis, protect and improve the environment. In this paper a renewable energy management system based on PDCA mode is designed to achieve the spiral increase of renewable marine energy efficiency, and achieve accurate evaluation of management system effectiveness based on entropy weight allocation theory. Taking the actual situation of marine energy utilization of a city in the last 6 years as the research data sample, in this paper, the positive impact of the PDCA management system model proposed in this paper on the improvement of the efficiency of various marine renewable energy management is analyzed.