A new digital image optical encryption method based on compressed sensing is proposed. With the advantage of the characteristics of compressed sensing as well as double random phase encoding technique, multi-encryption of digital image is realized. Compressed sensing is utilized to compress and encrypt a digital image with the random measurement matrix as secret key. Arnold transformation is used to scramble the encryption image with low data volume. The encryption image is encrypted again by double random phase encoding technique to realize the multiple encryption of image. Security overall process is taken into account in the scheme. The multi-encrypted information is embedded into the host image and transmitted. At the receiver, original image information is reconstructed. The experimental results show that the encryption scheme has such features as low data volume, strong robustness, high key sensitivity, and can resistance brute force attack.