Develop a net carbon sequestration accounting model for rice production and estimate the net carbon sequestration across 30 provinces in China from 2000 to 2021. Building on an understanding of its spatiotemporal dynamics, the study employs the coupling coordination model and the Tapio decoupling model to assess the degree of coupling coordination and the evolution of the coupling state between net carbon sequestration and rice output value. The results are as follows: (1) Overall, net carbon sequestration in China's rice production demonstrates a fluctuating upward trend, increased from 6634.50×10⁴t in 2000 to 7990.81×10⁴t in 2021. with notable spatial heterogeneity—higher values in the eastern regions and lower values in the west. The centroid of net carbon sequestration has shifted from the southwest to the northeast. (2) While there is spatial correlation in net carbon sequestration, the spatial agglomeration effect has diminished over time. The global Moran's I index shows a two-phase pattern, characterized by a "steady decline followed by stable fluctuations," with 2010 marking the transition point. (3) The coupling coordination degree between net carbon sequestration in rice production and rice output value across the 30 provinces follows a "decline followed by increase" trend. (4) In most years, the coupling relationship between net carbon sequestration and rice output value is generally favorable, with a gradual improvement in coupling effects. However, significant variability in the coupling status exists across different rice production regions and provinces.