The embodiments of the present application provide a resource extension method and device for a zone of a cloud service platform, an apparatus and a computer-readable storage medium. The method includes: pre-processing a cloud service platform; verifying a first virtual environment management platform in a zone of the cloud service platform by a single sign-on service; adding a cluster in a second virtual environment management platform to the zone of the cloud service platform by the single sign-on service, to complete resource extension for the zone of the cloud service platform. The embodiments of the present application could extend the zone resource of the cloud service platform, and could fully utilize the network of the zone, and don't need to modify the network segment of the tenant after extending the zone resource.