With the development of power grid scale,the power grid data increases massively.At present,due to the backward data encryption technology and poor processing effect of massive data,the power grid data security transmission system has low anti attack sensitivity.Therefore,a power grid data security transmission system based on chaotic encryption is designed.In the system hardware design,the embedded controller and information storage circuit are optimized to provide the basis for software optimization.In the software design,with the help of four-dimensional Chen discrete processing technology and chaotic dynamics theory,the power grid data encryption module is designed,and the weighted residual is used to detect the data intersection process,build the power grid data network attack detection module,and complete the design of power grid data security transmission system.The experiment results show that the anti attack sensitivity and encryption time of the system designed in this paper are better than the current system,and can be applied to practical work.