Abstract: Socialized service is an important way to promote the organic connection between farmers and modern agriculture. Based on the data of the Survey on the development index of the New Type of Agricultural Business Entity in China, the paper examines the level of socialized service acquisition by farmers and the level of product quality-safety certification and analyzes the influence of socialized services on farmers’ behavior of quality-safety certification by the IVProbit model. Results show that the average number of social services that farmers obtain is 1.424, and the proportion of farmers who have passed at least one quality-safety certification is 8.5%. Farmers’ behaviors of certification are significantly promoted by socialized services with heterogeneity. Among different parts of socialized services, post-production services have the greatest impact, followed by the pre-production services and in-production services. For different types of farmers, the promotion of small-scale farms is greater than large-scale farms. Research also shows that it is an effective route for farmers’ certification behaviors promoted by socialized services to release constraints on household resource endowment with expand product markets. Therefore, this paper suggests: to promote the supply-side structural reform of socialized services, to implement the incentive policies for small-scale farms to obtain socialized services, and to perfect the influencing path of socialized services on farmers’ certification behaviors.