The invention discloses a cloud hard disk realization method under a cloud computing architecture. According to the realization process, first, a distributed architecture is set up, wherein the distributed architecture comprises a user layer, a driving layer and a storage management layer in sequence from top to bottom, and the lower layer provides service for the upper layer; the user layer makes a cloud hard disk creation application; the driving layer receives the creation request from the user layer, completes cloud hard disk creation and forwards a cloud hard disk to the storage management layer for interactive storage; the storage management layer completes storage and management of the created cloud hard disk. Compared with the prior art, through the cloud hard disk realization method under the cloud computing architecture, the disk capable of being mounted on a virtual machine is created independently, unbinding, unloading, re-utilization and other technologies are realized, the hard disk is distributed and dispatched according to needs, practicability is high, the application range is wide, and popularization is easy.