The invention discloses a block chain-based anti-attack power network system, comprising a data receiving module and a power network, wherein an output end of the data receiving module is unidirectionally electrically connected with an input end of a data dynamic behavior analysis module, and an output end of the data receiving module is unidirectionally electrically connected with an input end ofan alarm module. The data receive module is arranged to achieve the effect of data reception; through an alarm, people can be reminded when there is data entry. Through the data dynamic behavior analysis module, the effect of analyzing and detecting the running state of the data is achieved. By a comparison module, the invention achieves the effect of data comparison. The system achieves the effect of data filtering by triggering a filtering unit, achieves the effect of power network protection by a protection processor, achieves the effect of hacking interception and defense by an interception and defense module, and can effectively prevent hackers from attacking the power network system, and is convenient for people to use.