<p>The field of logistics supply chain faces trust and efficiency challenges in data sharing, and traditional centralized solutions are difficult to meet the needs of modern supply chain management. Blockchain technology, with its decentralized characteristics, provides a potential solution path, but in practical applications, it still needs to overcome problems such as uneven node distribution and data security. Therefore, a logistics supply chain data sharing method based on blockchain sharding allocation is proposed to solve the trust problem and efficiency challenge of data sharing in the current logistics supply chain. First, the improved Ciphertext-Policy Attribute-Based Encryption (CP-ABE) algorithm is adopted to embed the access control policy directly into the ciphertext, which not only protects the security of data content, but also hides the access policy, and realizes fine-grained access control of data sharing. Then, by using smart contract technology, an automated data exchange process without third-party supervision is realized, ensuring that only transactions that meet the preset conditions can be executed, further improving the efficiency and security of the data sharing process. Finally, by integrating the InterPlanetary File System (IPFS), an efficient data storage and access control model is designed to ensure the secure storage and efficient distribution of data in the supply chain, thereby greatly improving the stability and processing capacity of logistics supply chain data sharing. Through experimental analysis of the standardization, balance, and transaction throughput of the grid partitioning scheme based on node attributes, it is found that the scheme can effectively improve the stability of supply chain data sharing and the data processing capacity of the blockchain system. Quantitative comparative analysis shows that the proposed method performs well in terms of security and stability, which can provide an effective solution for logistics supply chain data sharing.</p>