At present, the application of wireless Ad hoc network in the field of mobile security inspection is in its infancy, and the network security protection means for the power industry are still insufficient, which is highlighted by the lack of efficient security authentication means for Ad hoc network, and it is difficult to completely eliminate security risks such as illegal terminal intrusion, data counterfeiting and tampering. A decentralized security authentication scheme suitable for Ad hoc network is designed, which can solve the security trust transfer problem on the variable network topology. Under any network route, the security trust is transferred to the proxy node step by step through multiple peer authentication, and the authentication chain is eUEblished between the digital intelligence edge proxy device, the proxy node and the node to be accessed. On the one hand, it can effectively solve the counterfeit problem of A-nodes and proxy nodes; on the other hand, it can greatly reduce the problem of reduced security authentication efficiency caused by deepening network hierarchy.