Abstract: The current blockchain technology has the problems of low throughput, low storage capacity and high redundancy, which cannot meet the storage and sharing requirements of massive Internet of Things(IoT) data. In view of this situation, a blockchain of things data storage method based on verification chain + data chain double chain structure is proposed. This method deploys the verification chain and the data chain on the edge device and the edge server respectively, and adopts the fragment reconfiguration technology. Through the limited cuckoo principle, it ensures that each fragment can safely consensus and reasonably divide the nodes. The design of this dual-chain structure not only improves the security of IoT data, but also solves the problems of low throughput, low storage capacity and high redundancy of traditional blockchain storage architecture. At the same time, the fragmentation reconfiguration technology is used to enable the system to dynamically adjust as needed to meet the storage requirements in different scenarios. The experimental results show that this method improves the storage performance by 80% compared with the traditional blockchain storage architecture on the basis of ensuring system security, and greatly improves the data processing speed and data throughput.