The utility model provides an endorsing device used for intelligent transformer station information safety control. The endorsing device adopts an evolution ring endorsing method to identify false four-remoteness (remote-measurement, remote-communication, remote-adjustment and remote-controll) messages, solve possible severe safety hazards that a whole intelligent transformer station is controlled by forged messages and ensure the sending integrity and undeniability of information messages controlling the network of the intelligent transformer station. Nodes belonging to the same VLAN (Virtual Local Area Network) in the intelligent transformer station are categorized in a ring. MMS/GOOSE/SV messages transmitted inside each ring are respectively endorsed and authenticated through the evolution ring endorsing method. The messages are ensured to be not falsified during a transmission process. The evolution ring endorsing method ensures the integrity and the undeniability of messages during a message transmitting process. Information safety of the intelligent transformer station is thus guaranteed.