The consensus mechanism is the core of the block chain technology, which realizes that the highly dispersed nodes in the whole block chain network can quickly reach a consensus on the data and ensure the consistency of the whole network data.With the construction of ubiquitous electric power Internet of things, the mass terminal access system brings challenges to the information security of ubiquitous electric power Internet of things.Consensus, therefore, this article is based on block chain mechanism applied in extensive is in power the Internet of things, first overall architecture characteristics, analysis of block chain is applied to in power iot authentication link, to build the ideantity authentication algorithm based on block chain, resolved between terminal (SM) and Data aggregator (SP), improve the efficiency and safety certification, the certification of safety and reliability and block chain technology is consistent with the safety and reliability.The hashing algorithm is adopting to sign and check to improve the efficiency of the block chain in ubiquitous power Internet of things authentication and the scalability of the authentication process. RSA algorithm is applied in the authentication process for asymmetric encryption.Finally, analyzed the security and efficiency analysis, and point out the future flood in power iot identity trend of the construction of the management system, and expound how to build it in power iot complete identity authentication system, the paper research results could be used to block chain in the extensive application in the field of electric power network identity authentication to provide the reference.