Abstract: The capture fishery, a crucial component of the carbon sink fisheries, plays a significant role in oceanic carbon sink. This study evaluated the carbon sequestration of marine fishery organisms in Guangxi from 2003 to 2022 using the carbon content method. The results revealed that the total amount of carbon removal by marine capture fisheries in Guangxi from 2003 to 2022 was 1328002.76 tons, with an average annual carbon removal of 66 400.14 tons. Among the total carbon removal, fish contributed the most (928 300 tons, 69.90%), followed by shrimp (135 600 tons, 10.21%), crabs (109 600 tons, 8.25%), shellfish (97 800 tons, 7.37%), and cephalopods (56 700 tons, 4.27%). In recent years, the carbon sequestration of marine fishery populations in Guangxi has shown significant fluctuations, with carbon removal, total carbon sequestration, and net carbon sequestration all exhibiting a declining trend. This is primarily influenced by fishery catch volumes and the carbon content of fishery species. To promote the sustainable development of marine fishery carbon sequestration in Guangxi, it is advisable to establish a fishery carbon sink compensation mechanism, pilot fishery carbon sink trading, introduce new policies to enhance support and subsidies for carbon sink fisheries, and promote the payment of ecological services for fishery carbon sinks. These measures will facilitate the monetization of ecological services provided by fishery carbon sequestration, ultimately contributing to the vision of achieving carbon neutrality.