The blockchain-based B2B transaction platform payment introduced in this article is to build a credible trade chain. It was created to build a comprehensive application platform for B2B transaction parties，financial parties，and regulators to realize the entire process of business data precipitation and transactions supervision，also to guarantee the authenticity and reliability of B2B transaction platform data. At the same time，it is to continuously build a service system based on banking + smart contracts + Internet insurance + Internet arbitration to provide companies with more reliable services. Blockchain-based B2B transaction platform payment is utilizing banks as account transaction nodes to establish B2B transaction platform alliance blockchain，combining blockchain technology with bank-managed cash guarantees and credit guarantee systems to achieve smart contract-driven fund security management and control service platform. The client’s funds are always kept in the bank’s physical account during the entire guarantee process. In the future，by gradually inviting online arbitration，notarization，insurance and other institutions to join，combined with on-chain data sharing and traceability capabilities，it is possible to detect and deal with abnormal risks in a timely manner to ensure the safety of users’ funds.