Agriculture is the main industry in China. A safe, credible, stable, traceable, information-sharing, and large-throughput agricultural supply chain system is needed to achieve agricultural informatization. At present, information about China’s agricultural product supply chain has been stored in a centralized database and file system, with weak information management capabilities, leading to problems such as theft, tampering, deletion, and inconsistencies. In light of these problems, an efficient extraction method which combines an interstellar distributed file system and smart contract technology for heterogeneous information data in agricultural product supply chain is established. This method achieved fast extraction of large heterogeneous information transaction logs which including agricultural product production information, recording transportation information, consumer credit information, farmer-consumer transaction services. All kinds of information transaction logs and transaction records are stored in blockchain and IPFs network respectively. It proposed an access control method for agricultural product supply chain information data based on blockchain smart contracts, combined with an access method based on IPFS hash addressing, which can effectively ensure different agricultural production and operation participants access data within their authorities. A data management system of agricultural products supply chain based on blockchain technology is designed, which can ensure the transforming and upgrading of agriculture, thereby helping farmers increase their income and eliminate poverty.