Abstract: 【Purpose/significance】Current digital student record management and sharing with employers face issues such as data tam⁃ pering and privacy leakage. To address these issues, this paper proposes a blockchain-based secure sharing model for student educa⁃ tional records, utilizing tiered encryption【. Method/process】A tiered encryption strategy is employed, providing differentiated encryp⁃ tion for student record information based on privacy levels. ECC, AES random encryption, and hash encryption are applied to process the student data, balancing security and efficiency. Proxy re-encryption is combined with smart contracts to avoid over-reliance on third-party servers and the direct transmission of student private keys. A proxy smart contract is constructed to ensure secure sharing of student educational records.【Result/conclusion】The blockchain model proposed in this paper is implemented in a HyperLedger Fabric environment, with tiered encryption applied off-chain. Comparisons with traditional encryption schemes demonstrate that the proposed approach effectively balances security and efficiency. The integration of proxy re-encryption with smart contracts is tested using Tape, showing that the throughput meets the requirements of typical systems【. Innovation/limitation】To enable secure sharing of student educational records with employers, this paper presents a blockchain-based sharing model using tiered encryption, which bal⁃ ances security and efficiency. By constructing proxy smart contracts, the model ensures secure sharing.