National parks have a crucial role in safeguarding biodiversity and ecological functioning, while also fostering the healthy coexistence of humans and nature. Marine national parks are integral components of the national park system, abundant in marine biological resources, and serve as a pioneering region for recognizing the worth of marine ecological products. The recognition of the significance of marine ecological products within marine national parks is essential for advancing the development of marine ecological civilization, converting marine ecological benefits into economic benefits, and satisfying the public's demand for top-notch marine ecological products. Currently, research on marine national parks is burgeoning internationally, with scholarly perspectives expanding from ecological conservation to encompass park planning, management, and collaboration among relevant stakeholders. There is widespread recognition of the ecological service value provided by marine national parks. In China, the development of marine national parks is in its nascent stages, and research primarily focuses on conceptual analysis, construction background, ecological conservation significance, and drawing on foreign construction experiences. However, there is inadequate understanding of the ecological value of marine national parks and further research is required to explore how to better harness the functionality of such parks, as well as to reconcile the conflicts between conservation and development. Changdao exemplifies the characteristics of marine national parks, including exceptional natural resources. This study investigates the process and mechanism of achieving the value of ecological products in marine national parks, using the Marine Ecological Civilization Comprehensive Experimental Area of Changdao as a case study. The aim is to address the practical conflict between ecological preservation and economic growth, and to achieve a sustainable and efficient provision of high-quality marine ecological products. The study develops a categorization system for ecological products in Changdao National Park, based on the MA classification standard and the park's current conditions. The system categorizes ecological products into three types: supply service products, regulatory service products, and cultural service products. An analysis is conducted on the value composition of the pilot ecological products of Changdao National Park, using the labor theory of value and utility theory of value. The proposal outlines several approaches to realize the value of ecological products in Changdao National Park, taking into account their various characteristics. These approaches include ecological protection compensation, ecological product premiums, natural resource carbon trading, ecotourism, and environmental education. Additionally, the proposal summarizes the mechanisms needed to achieve the value of ecological products in the park. These mechanisms include an ecological product investigation and monitoring mechanism, a protection and compensation mechanism, an operation and development mechanism, and a safeguard mechanism.