Abstract: Innovation in socialized service mechanism represents a crucial pathway to achieving agricultural green development. Based on panel data from 31 Chinese provinces (excluding Hong Kong, Macao, and Taiwan) from 2008 to 2022, this study treats the pilot policy of full-process agricultural production socialized services as a quasi-natural experiment to capture innovation in socialized service mechanisms, and uses agricultural green total factor productivity to measure the level of agricultural green development. The study employs a difference-in-differences (DID) approach to empirically examine the impact and mechanisms of socialized service mechanisms innovation on agricultural green development. The findings reveal that 1) innovation in socialized service mechanisms significantly promotes agricultural green development; 2) such innovation facilitates agricultural green development through scale operation effects, factor flow effects, and technological progress effects; and 3) heterogeneity analysis shows that in the central, western regions and the northwest of the Hu Huanyong Line, the promoting effect of the innovation of socialized service mechanisms on agricultural green development is more significant. Based on these findings, the paper puts forward countermeasures and suggestions, including strengthening policy promotion and implementation, optimizing policy pathways, and implementing differentiated policies.