The invention discloses a multilayer data encryption method suitable for a cloud environment. The method comprises the steps of receiving a cloud hard disk application sent by a user end and verifyingwhether the user end has an operation permission or not; when the user end has the operation permission, generating a logic disk according to the cloud hard disk application, and mounting the logic disk to the user end; formatting the logic disk, writing data in the logic disk, and sending a data writing request to a plurality of physical disks corresponding to the logic disk; and segmenting thedata into a plurality of data blocks, performing discretization, and randomly storing the discretized data blocks in the physical disks. According to the multilayer data encryption method suitable forthe cloud environment, a multilayer protection system of user data in the cloud environment is provided; and when any layer is broken, a corresponding mechanism ensures that leaked data is unreadableand cannot be reversely decrypted, so that the user data security is ensured.