Reasonably and rapidly evaluating the service values of mangroves and their ecosystems is not only urgent for legislation and management but also a significantly theoretical issue. So far, 89.19% of domestic relevant literature focused on case studies and lacked systematic analysis at the national level. Based on literature review, an index system consisting of 24 indicators was formed to assess the Chinese mangrove ecosystems. By discounting each indicator and defining the functions of mangrove influence rates, the baseline values of the Chinese mangrove ecosystems (BVE) and mangroves (BVM) were evaluated for the first time. The results indicated that the values were 98.74 and 216.79 ten thousand Yuan hm^-2 a^-1 for the BVE and BVM in 2019, respectively. For the BVM, 57.12% of the BVM was directly generated by the mangrove itself, and 42.88% was the value of adjacent wetlands that contributed indirectly by mangrove services. By using ratios of GDP per capita, the baseline values in the southeastern coastal provinces (region) of China were determined to range from 59.84 to 149.90 ten thousand Yuan hm^-2 a^-1 for the BVE and BVM from 131.39 to 329.12 ten thousand Yuan hm^-2 a^-1. The mean value of every single tree in Guangxi mangroves in 2019 was 103.78 Yuan/a, which was available in calculating any certain tree value through weight data of species, tree height, origin, and growing site. In addition, the paper discussed the scientific features of the theoretical model, the baseline values of mangroves, the mangrove values to different regions, and some suggestions for management applications.