Abstract: The present invention discloses a storage-sharing bus switch, which comprises a bus exchange device, a controller and a plurality of non-transparent bridge devices. The bus used in the present invention is PCI or a like system bus. The bus exchange device connects with the controller and a plurality of storage devices and links to hosts via the non-transparent bridge devices. The storage-sharing bus switch executes data transmission between hosts and storage devices. The controller starts up and monitors the devices linking to the storage-sharing bus switch. The non-transparent bridge devices implement data transmission between hosts and the storage-sharing bus switch and separate the hosts from the devices linking to the storage-sharing bus switch lest operation errors damage the devices. The present invention enables a plurality of hosts to share data storage simultaneously.