This paper proposes a blockchain and trusted execution environment (TEE)-based privacy-preserving sharing scheme for healthcare data that supports incremental updates. The scheme leverages chameleon hash and TEE to achieve reliable off-chain incremental updates and verification without modifying on-chain data, reducing the overhead of authentication, access control, and rewards. Symmetric encryption protects off-chain data, while data verification, decryption, and computation are performed within TEE. The system includes a shared blockchain (SB) for on-chain data and an updated blockchain (UB) for off-chain incremental updates. Smart contracts manage data upload, access control, and key authorization. The scheme ensures secure and verifiable data sharing, maintaining data ownership and traceability. Experimental results demonstrate the feasibility and effectiveness of the proposed scheme, showing reduced gas consumption and computational overhead compared to non-TEE environments. The scheme addresses the challenges of incremental updates in healthcare data sharing, enhancing privacy and security.This paper proposes a blockchain and trusted execution environment (TEE)-based privacy-preserving sharing scheme for healthcare data that supports incremental updates. The scheme leverages chameleon hash and TEE to achieve reliable off-chain incremental updates and verification without modifying on-chain data, reducing the overhead of authentication, access control, and rewards. Symmetric encryption protects off-chain data, while data verification, decryption, and computation are performed within TEE. The system includes a shared blockchain (SB) for on-chain data and an updated blockchain (UB) for off-chain incremental updates. Smart contracts manage data upload, access control, and key authorization. The scheme ensures secure and verifiable data sharing, maintaining data ownership and traceability. Experimental results demonstrate the feasibility and effectiveness of the proposed scheme, showing reduced gas consumption and computational overhead compared to non-TEE environments. The scheme addresses the challenges of incremental updates in healthcare data sharing, enhancing privacy and security.