This paper proposes a more efficient POA consensus algorithm without sacrificing security. Searchable encryption technology is utilized to complete the effective search of encrypted data and ensure fairness between supply chain data users and cloud servers. Integrate blockchain smart contract technology with traditional contract coordination mechanisms to construct a model for smart contract coordination. Comparative experiments and performance test analysis are used to explore the effectiveness and applicability of blockchain technology in the supply chain. The results show that the maximum number of allowed evil nodes for the POA consensus algorithm is 53.13%, which is the best overall performance compared to other algorithms. The security threshold for the smart contract coordination mechanism is in the range of 29%-52%, with higher security redundancy than DRSD contracts. Searchable cryptography produces plaintext and ciphertext in a shorter amount of time and has better attack-defense performance. Blockchain technology is used in the supply chain system to display the transaction information in real-time, and through the evaluation practice, the supply chain based on blockchain technology is relatively controllable for each information security event.