Abstract: Exploring the effective application of blockchain technology in agricultural industrial chain will help accelerate the pace of agricultural and rural modernization. Taking the hairy crab industry in Xinghua, Jiangsu Province as a case, this paper discussed the realization path of blockchain technology to promote the optimization of agricultural industrial chain. It is found that in view of the difficulties in supervision and management of Xinghua hairy crab industry chain, lack of financial support, lack of scientific and technological guidance, and weak promotion of brand added value, Xinghua city had followed the new wave of “digital agriculture” and “blockchain technology”, and effectively promoted the optimization and upgrading of agricultural industry chain by building a “ring-chain-layer” industrial chain model, providing digital agricultural services in industrial chain, and strengthening cooperation among industrial chain organizations. This typical exploration provided a reference for the study of digital agriculture to promote the revitalization of rural industries.