The invention provides a network traffic collaborative unloading method and a controller, and relates to the technical field of the computer network communication. The method comprises the following steps: sensing and recording user node state information in real time according to request data sent by a user node, and classifying and storing the user node state information; selecting one user nodeas an unloading source node according to the classified user node state information, and taking other user nodes except the unloading source node as a subscription node; sending the node informationof the unloading source node to all user nodes in a communication subset, wherein the unloading source node establishes connection with a server to receive network data traffic after confirming the own identity, and the unloading source node can sufficiently utilize the direction communication between the equipment to distribute the data. An unloading source is selected by adopting a collaborativeunloading source selection policy, the unloading source node can sufficiently utilize the direct communication between the equipment to distribute the data, the network resource is sufficiently utilized, the transmission efficiency is effectively improved, the traffic transmission pressure of a core network is lightened, and the user experience quality is guaranteed at the same time.