As an ecologically and economically sensitive zone, coastal wetlands serve as a typical carrier for the functional evolution of “Production-Living-Ecological Spaces” (PLES). This paper takes Liaohe Delta National Park as the research object, a critical coastal wetland ecosystem. The study employs a dual-method research approach, integrating multi-source remote sensing data from 2000 to 2024 with advanced GIS spatial analysis techniques. This method combines the Support Vector Machine (SVM) classification algorithm for precise land use/cover mapping and a policy contribution degree model to isolate governance impacts. This comprehensive approach enables us to conduct rigorous quantitative analysis of the spatiotemporal differentiation patterns of PLES changes under tourism pressure, revealing the spatial restructuring mechanisms of coastal wetland-type national parks. The core findings reveal three significant dimensions of change:(1) Dynamic PLES transition patterns: The PLES in the Liaohe Delta exhibit dynamic characteristics of“alternating ecological contraction and restoration, as well as composite expansion of production and living spaces”. From 2000 to 2015, ecological space underwent substantial degradation, declining at an average rate of 7.96 km2 per year, primarily due to land reclamation for aquaculture and urban encroachment. A decisive reversal occurred post-2015 with the implementation of the “Restoring Wetlands by Ending Aquaculture” initiative. This policy intervention drove an average annual increase in wetland area of 3.2 km2. Crucially, Suaeda salsa coverage in the ecologically iconic Red Beach surged dramatically from 15% to 82%, signaling robust habitat recovery. Concurrently, integrated production-ecological spaces experienced explosive growth of 2140.16%, forming a virtuous cycle of “policy driven-ecological restoration-industrial transformation”.(2) Tourismification as spatial reconstructor: Tourismification has fundamentally reshaped spatial functions through innovative place-making strategies. These include the integration of agriculture and tourism via visually striking “paddy field paintings” and the revitalization of decommissioned industrial sites into petroleum cultural parks. Consequently, dedicated tourism land within scenic zones expanded by 321.43%. This spatial restructuring actively engaged local communities in tourism services, elevating residents’ per capita annual income and demonstrating the successful convergence of ecological value, economic benefits, and tangible livelihood improvement.(3) Policy efficacy and governance innovation: Policy regulation contributed 64.8%, with the ecological points system and “three zones and three lines” management framework proved instrumental in balancing conservation and development imperatives.This highlights the “government-led and multi-party co-governance” model established in the Liaohe Delta, which demonstrates greater resilience in addressing sudden environmental incidents and community collaborative governance, and its “productive conservation” philosophy overcomes the limitations of traditional isolated protection. It ultimately provides scientifically grounded, replicable spatial optimization strategies and methodological frameworks for advancing “protective development” in coastal wetland national parks.