Power distribution network control system safety protection method and system

The invention relates to a power distribution network control system safety protection method and system. The method comprises the following steps of judging whether the data type of messages is an application data type; if yes, screening messages with a power distribution network communication protocol number and discarding messages without the power distribution network communication protocol number; further performing protocol detection on the screened messages with the power distribution network communication protocol number; screening messages satisfying the power distribution network communication protocol and discarding messages failing to satisfy the power distribution network communication protocol; and forwarding the messages satisfying the power distribution network communication protocol. The screened messages are safe. It can be guaranteed that distribution terminals and a primary station will not receive any other message beyond the power distribution network communication protocol. Risks that the whole power distribution network control system is attacked by hackers and large-scale blackout is resulted are prevented. Information safety of the power distribution network control system is thus guaranteed.