Automatic switchover device is very important to ensure the reliability of the power system. However, the equipment is deployed in substation construction and lack of global information grid, which is not conducive to give full play to the standby power input function. This paper proposes to establish the centralized checking and decentralized control automatic switchover system. The system includes three functions, i.e. monitoring and analysis, online switching, offline check. At the same time, this paper introduces several key technologies related to the system, including the modeling of automatic switchover, control strategy based on risk assessment, data reliability and control check of power network automatic switchover system. Application examples show that the centralized checking and decentralized control automatic switchover system can integrate the whole network information and reduce the risk of power grid operation.