The invention belongs to the technical field of computer application, and particularly relates to an Internet of Things dynamic data tracing method and device based on an alliance chain, and the method comprises the steps: building a multi-dimensional DAG graph, and building a dynamic data security problem model; analyzing a single node in a group game process to make a decision of integrity behavior motivation, and obtaining a consensus boundary condition of each node; authorizing part of trust nodes to form a verification node list according to boundary conditions, and maintaining the verification node list based on reputation consensus excitation; and generating an entity authorization relation according to the dynamic data, the authorization relation between the entities and the key pairs for verifying the authorization of the entity to the dynamic data, creating a multi-dimensional authorization chain between the entities, and publishing the multi-dimensional authorization chain as a transaction to an authorization relation alliance chain network. According to the method, trace reservation and tracing in the dynamic data operation process of the Internet of Things are achieved. The method has high double-output attack resistance, replay attack resistance and hidden attack resistance, and unauthorized access operations such as tampering and forgery of the dynamic data of the Internet of Things by attackers are effectively eradicated.