China’s transaction platform for grid procurement features a huge transaction amount, a large number of suppliers, and strict process control requirements. The transaction data platform for grid procurement proposed in this study is based on Hyperledger Fabric technology and methods at the database level, such as hash calculation of data, data fingerprint extraction, access control, and fast data reading. It can achieve multi-level data protection and data tamper-proofing through the entire life cycle of procurement transaction data and can effectively control the trust crisis that may be caused by the asymmetry of information among subjects of the procurement transaction platform. Finally, the feasibility of the prototype system for the proposed strategy is verified by the experimental analysis of the protection performance of the system.