The embodiment of the invention provides a fault node isolation method and a cluster system. The method comprises the following steps: firstly, each node of the cluster system detects whether a faultnode having an access storage fault exists in the cluster system; when the fault node exists, sending, by the fault node, information of a cluster file system that cannot be accessed by the fault nodeto normal nodes in the cluster system; and finally, dismounting, by the fault node, the cluster file system that cannot be accessed by the fault node. By adoption of the method, in the case of storage network abnormality, the cluster file system that cannot be accessed is isolated, compared with the manner of directly isolating a physical host where the node is located, the granularity of the isolation is smaller, and the other services on the node are not affected.