The embodiment of the invention provides a carrying resource allocation method for a clouded data center network, a device and a system. The method comprises the following steps: receiving a communication path request sent by a cloud platform management device by using an SDN (Software Defined Network) controller, wherein the communication path request carries the address information of a home terminal node, the address information of an opposite terminal node, and bandwidth demand information and QoS (Quality of Service) demand information between the home terminal node and the opposite terminal node, and the cloud platform management device, the home terminal node and the opposite terminal node are positioned in the clouded data center network in which the SDN controller is positioned; allocating a communication path which is consistent with a bandwidth demand and a QoS demand to the home terminal node and the opposite terminal node from network resources managed by the SDN controller according to the address information of the home terminal node, the address information of the opposite terminal node, the bandwidth demand information and the QoS demand information; and transmitting a forwarding flow table of the communication path to forwarding plane equipment of the clouded data center network in order to establish a forwarding plane communication path between the home terminal node and the opposite terminal node through the forwarding plane equipment.