Abstract: To ensure the security of power network data, a secure encryption method for power network dual chaotic data under key matrix node transformation is proposed. Lossless compression of power network data, using Logistic mapping method and Henono mapping method to generate three chaotic power network data sequences. The sequence is the initial encryption matrix, and the sequence data is placed in the key matrix. The key matrix is transformed by matrix nodes to encrypt the power network data. Then, the transformed power network data matrix is multiplied by the initial encryption matrix, After performing fractional Fourier transform on different horizontal directions, the encrypted complex matrix of the power network data is obtained. After calculating the amplitude spectrum of the matrix, it is transformed from the frequency domain to the spatial domain to complete one power data encryption, and the process is repeated to achieve a second encryption. The experimental results show that this method can achieve lossless compression of power network data and effectively encrypt image and character power network data, with good application effects.