The large-scale and rapid development of tourism has led to many challenges in the sustainable development of Ecological Conservation Areas (ECAs). In this study, we constructed the model of the development potential of green tourism (DPGT) in ECAs. We then used this model to measure and analyze the spatial-temporal evolution of DPGT in Beijing's Ecological Conservation Area (BECA), and built the enhancement model of DPGT in BECA. Our results demonstrate that the DPGT in BECA continued to rise from 2011 to 2020, showing the spatial characteristics of high in the north and low in the south. Each district has a different development focus, so differentiated management measures need to be implemented in the different areas. Finally, we built the enhancement model of DPGT in BECA, with “zoning management, focused implementation” as the guideline, protective development of resources as the basic force, ecological optimization of the whole process as the sustainable force, high-quality building of industries as the core force, and the insistence on multi-subject participation as the guarantee force. This study developed a new method to measure DPGT in ECAs, and provided a systematic management framework for green tourism and regional green development in ECAs.