As an important part of the green space system in high-density cities, pocket parks provide the city with natural ecological functions, including microclimate regulation, stormwater management, and so on, and also play an important role in improving the city image, promoting neighborhood communication and other social benefits. However, at present, there has been little research on the accessibility of pocket parks. Based on the theory of space syntax, pocket parks in Xuzhou old city are selected as the research object. From three dimensions of global integration, local integration, and perceived integration, the accessibility of pocket parks in Xuzhou old city was quantitatively evaluated by Depthmap software. The results showed that (1) the global accessibility and local accessibility of pocket parks in the study area were good, but the distribution of some pocket parks was "misaligned" with the road network layout and (2) the perception accessibility of some pocket parks is low, and the whole road network is perceived through the local road network structure. As a result, many people cannot find the park quickly even if they are close to the green space of the park. Because of the existing problems of pocket parks in Xuzhou old city, we put forward optimization suggestions to increase the accessibility measure of pocket parks in Xuzhou from a humanistic perspective and provide a basis for the distribution of urban pocket parks.