Abstract: Based on carbon emissions and carbon sinks, the carbon emissions of China’s marine fisheries were calculated, and the undesired output super-efficiency SBM model was used to estimate the carbon emissions efficiency of China’s marine fisheries from 1980 to 2019. Regional disparities were quantitatively analyzed at the regional and regional levels, and finally the carbon emission reduction potential of China’s marine fisheries was estimated. The results showed that: The overall carbon emission of marine fisheries showed an increasing trend year by year during the study period. The average level of carbon emission efficiency of China’s marine fisheries in China was relatively high, and the overall trend of rising first and then slowly decreasing.The regional differences in the carbon emission efficiency of China’s marine fisheries were obvious. The variation trend calculated by the mathematical statistical analysis method has a high consistency, and the overall evolution pattern is fluctuating and expanding.The carbon emission reduction potential level of China’s marine fishery is relatively stable, and the overall trend is fluctuating and rising. It is divided into three fluctuation periods. There are various types of emission reduction potentials.