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Developing sustainable island tourism must be thoroughly evaluated in consideration of ecological, economic, and social factors on account of the fragility of island ecosystems. This study evaluated the ecological footprint (EF) and ecological capacity of Liuqiu Island from 2010 to 2015 using the EF model, establishing an indicator to estimate the value of ecosystem service and eco-security. The empirical results include: (1) the overall value of ecosystem service on Liuqiu Island increased from US$3.75 million in 2010 to US$5.11 million in 2015; (2) the total per capita EF considerably increased from 0.5640 gha/person in 2010 to 4.0845 gha/person in 2015; and (3) the ecological footprint index increased from 0.30 in 2010 to 2.28 in 2015. These findings indicate that island tourism recreational zones gradually increased the pressure on its ecosystem, reduced the eco-security level, and severely damaged the environment, thereby threatening the function and structure of the entire ecosystem. The innovations and contributions of this study is integrating ecological footprint and ecosystem services valuation provide insights into sustainability of an island. The theoretical and practical implications identified in this study should contribute to reducing the gap between research and practice.