In order to solve the current problem of manual measurement data entry in aquatic transactions that is susceptible to tampering and loss， this study proposes a secure model for collecting and transmitting such data， based on blockchain technology. Firstly， a data collection platform based on Raspberry Pi is designed for automatic data collection and input； Secondly， secure the transmission and storage of collected transaction data through smart contracts and consensus mechanisms； Finally， based on blockchain technology， a set of aquatic transaction measurement data collection and transmission system is designed to achieve aquatic transaction measurement data collection and query functions， and a test environment is built based on the Hyperledger Fabric platform for verification. The results show that the data collection and transmission system based on blockchain technology can effectively complete data collection， ensuring data security during data transmission and storage. The data transmission rate can reach 100%， and the packet loss rate is lower than traditional transmission systems. The results indicate that the model proposed in this study effectively improves the security and reliability of data， enhances the efficiency of aquatic product transactions， and is more suitable for practical applications in aquatic product transactions.