Aiming at the problem that the centralized deployment mode of traditional supplier information base is difficult to ensure the authenticity of data and system security, a heterogeneous supplier electronic file storage system of blockchain is constructed. Firstly, the distributed storage of heterogeneous data is carried out according to the blockchain and interPlanetary file system(IPFS), the blockchain saves small files, and the IPFS network splits and stores heterogeneous large files, so as to improve the storage speed of files. Then, the file access control strategy of blockchain smart contract is adopted to ensure the security and transparency of supplier file management and meet the file security access in multiple scenarios. The simulation results show that the system can not only ensure efficient throughput performance, but also effectively ensure the information security and privacy on the chain.