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Image encryption as an important branch of the field of information encryption, the importance of information security becomes more and more important, to encrypt gradually becomes a research hotspot of image information effectively. In order to improve the security of image encryption is proposed, which uses the initial value sensitivity of chaotic system and the characteristics of random like, put forward a new kind of "chaos transform for image scrambling algorithm, then on the basis of combining wavelet theory to design a digital image encryption algorithm. In the preprocessing phase of the image, four wavelet sub images are firstly obtained by using wavelet transform, then four subgraphs are scrambled based on chaotic permutation. Finally, the target encrypted image is restored by inverse wavelet transform. The numerical simulation results show that the image obtained by this method has very high consistency with the original image, and achieves higher security.