Reliable resource pre-allocation method and system in network target range

The invention discloses a reliable resource pre-allocation method and system in a network target range. According to the method, a coordination node is additionally arranged, the total amount of physical resources needed by instantiation of all nodes in a target range scene is counted, the amount of occupied pre-allocated resources is applied to the coordination node, and the coordination node judges whether the total amount of available resources of a computing cluster is sufficient or not; registering a resource recovery address and a resource active query address of the scene to the coordination node; instantiating the virtual machines in the scene one by one through the virtualization platform, and synchronizing the instantiation information of the virtual machines to the coordination node; the coordination node updates and calculates the total quantity of the instantiated allocated resources of the cluster and the pre-allocated resource quota corresponding to the scene; and if the instantiation of the vi