To investigate the organic carbon storage in the surface soil of urban parks, representative parks within the Shanghai Ring Belt Park were selected as the research subjects. Surface soil samples (0~30 cm) from each park were collected utilizing the core cutter method, Subsequently, the soil organic carbon (SOC) content and SOC density were analyzed, and the soil organic carbon storage was calculated based on these measurements. The results indicated that the SOC content in different parks ranged from 7.30 g/kg to 34.17 g/kg, with an average value of 12.74 g/kg. Among the locations analyzed, Meilong Ecological Park exhibited the highest SOC content, whereas Li’an Park demonstrated the lowest. The SOC density across the various parks ranged from 26.32 t/hm2 to 119.83 t/hm2, with an average value of 47.40 t/hm2; notably, Meilong Ecological Park possessed the highest density, while Jinhai Wetland Park registered the lowest.The SOC storage of different parks ranged from 0.03 × 104 t to 1.97 × 104 t, with an average of 0.48 × 104 t, and the total SOC storage of all parks was 5.40 × 104 t. Specifically, Gucun Park had the highest storage, whereas Li’an Park had the lowest. The results of this study can provide a reference for the evaluation of soil quality, as well as the calculation and management of carbon storage in urban park green spaces in Shanghai.