The embodiment of the invention provides a service-oriented global network resource allocation method and a device thereof. The service-oriented global network resource allocation method comprises thefollowing steps: obtaining service information and network resource information of the global network resource equipment; generating service policy information according to network resource information and service information; judging whether the service policy information matches the topology information of the current network equipment; when the service policy information matches the topology information of the current network equipment, allocating the network resources of each service according to the service policy information. The invention provides a service-oriented global network resource allocation method and a service-oriented global network resource allocation device, which consider the load condition of the global network resource, allocate the network resource to the serviceby referring to the global network resource, reduce the conflict of the network resource distribution among the services, make the network resource allocation more reasonable, and improve the utilization rate of the whole network.