It is of great significance to accurately learn the spatial and temporal variation pattern of the carbon flux in the South China Sea, especially under the background of the construction of strong maritime country and China's carbon peak and carbon neutralization strategy. The characteristics of the particulate organic carbon (POC) flux at the bottom of the euphotic zone in the South China Sea are analyzed based on the monthly data set of the organic carbon flux from 2009 to 2018. The results are shown as follows. (1) The annual mean POC export flux in the South China Sea is 55.40 mgC·m^-2·d^-1; the value of POC export flux in the South China Sea is high in the nearshore zone, medium in the continental shelf, and low in the sea basin. (2) The value of POC export flux at the bottom of the euphotic zone in the South China Sea is the highest in winter, followed by spring and autumn, and the lowest in summer; the mean values of POC export flux in January, April, July, and October are 82.43, 47.37, 46.34, and 54.75 mgC·m^-2·d^-1, respectively. The results can provide technical support for comprehensively understanding the process and mechanism of the carbon cycle in the South China Sea.