The invention discloses a method and a device for realizing that a plurality of operation systems share a storage medium. The method comprises the following steps: an appointed first operation system in the operation systems directly operates the shared storage medium; when any second operation system in the operation systems needs to operate the shared storage medium, the second operation systeminforms the first operation system of an operation request through a inter-core communication mechanism; and the first operation system completes the operation to the shared storage medium according to the operation request and informs the second operation system of the operation result through the inter-core communication mechanism. The technical scheme of the invention is simple and efficient.