Aiming at the problems of high data processing delay and high computing overhead in the current power system,a block chain based on anonymous network model of power plant core big data is proposed.Firstly,a data aggregation framework is designed by integrating fog computing and blockchain,so as to realize an efficient and secure data aggregation process.Secondly,based on encryption,batch aggregation signature and anonymous authentication algorithm,a secure and anonymous data aggregation mechanism is proposed,which greatly reduces the computational overhead.The experiment results show that the proposed scheme has significant advantages in improving the security performance of the system.When the total number of attackers to manipulate exceeds 500,the probability of successful attack of the proposed scheme is close to 0.In addition,with the increase of the number of smart meters,the computational cost of the proposed method is lower than that of compressed sensing data aggregation method.The simulation results further verify that the proposed scheme can improve the security and robustness of the system.