Quantum image encryption is a typical problem in quantum image processing. At present, most documents are based on geometric transformations, which is used to encrypt images of 2n×2n size. This encryption method cannot satisfy the image of any size and is of obvious cyclicity. When the number of transformations reaches a certain number, the image will be restored. Based on scrambling of pixels, a new encryption method is proposed. An improved NEQR model is used to represent quantum color images, then the pixel are scrambled. Random rotation to each of the pixels is carried out by a quantum revolving gate. Then, the image is encrypted and not contained any original information.