The invention discloses a wireless sensor network cooperation method based on a dynamic link. A specific embodiment of the method comprises the following steps: establishing a tracking link on the surrounding of a target to track the target, wherein with the movement of the target, the tracking link gradually increases or deletes nodes therein; receiving sensing data sent by an upstream node by each node of the tracking link, performing fusion processing on the data and the data observed by itself, generating new data, and sending the new data to a downstream node until to a chain head node, fusing all received sensing data with the data observed by the chain head node, and sending the fused data to an aggregation node; and serving as the chain head node by each node on the tracking link in turn. By adoption of the method, on one hand, the problem that when the position of the target changes in the existing structure based on dynamic cluster or tree, the cluster or tree needs to reestablished to generate a large cost, and on the other hand, the sensing data of the tracking node can be locally fused, thereby improving the data transmission efficiency of the network.