Based on social capital theory, related factors of three dimensions（structure dimension, cognition dimension and relation dimension）of farmer social capital are taken as independent variables, and famer’s willingness to cooperatively supply agricultural disaster reduction public goods is taken as dependent variable. Taking 515 farmers in 27 villages of Hubei Province as investigation objects, the influence of farmer social capital on cooperative supply willingness of agricultural disaster reduction public goods is explored by Logistic regression model. Research results show that social solidarity, common value concept, social trust and reciprocal content have positive impact on farmer’s willingness of cooperative supply, while annual household income, number of agricultural disaster reduction public goods and social network have negative impact on farmer’s willingness of cooperative supply.