This paper proposes the"intelligent"maintenance strategy of power grid security based on blockchain technology,which can effectively improve the efficiency,accuracy and security of power grid maintenance.Through the introduction of blockchain technology in the power grid system,including encryption technology,intelligent terminal,smart grid data management,on-site operation monitoring,information vulnerability security detection technology,the transparency,imtamability and traceability of power grid data can be realized,so as to ensure the safe and stable operation of the power grid system.At the same time,this strategy can also improve the intelligent level of power grid maintenance,reduce manual intervention and errors,and improve the efficiency and quality of power grid maintenance.