Based on the measurement of the level of agricultural digital transformation in each province，this paper uses the extended STIRPAT model and provincial panel data from 2005-2022 to test the carbon emission reduction effect of agricultural digitization and its action mechanism.It was found that agricultural digitalization has significantly promoted carbon emission reduction，with green technological innovation-particularly substantive green innovation-serving as a key mechanism.Heterogeneity analysis reveals that the carbon reduction effects of agricultural digitalization are more pronounced in eastern regions，provinces with high levels of human capital，and those with advanced digital infrastructure.The results from panel threshold regression indicate a double-threshold effect based on the level of digitalization：only when agricultural digitalization surpasses certain threshold levels does its carbon reduction effect fully manifest.The study also found that the carbon emission reduction effect of agricultural digitization exhibits significant spatial spillover effects，which are more likely to occur between geographically proximate or adjacent regions.