The invention discloses a neighbor discovery method based on node cooperation. The invention designs a neighbor discovery method based on node cooperation according to the characteristics of a low-duty-ratio wireless sensor network. According to the method, nodes within a specific distance threshold value are regarded as a cooperative group based on the receiving intensity of signals, and awakening time slots of all the nodes in the group are replanned, so that the nodes in the group are jointly responsible for an awakening task of an awakening time table of the cooperative group. Meanwhile, the optimal group scale capable of maximizing the energy efficiency of the cooperative group is researched, factors which cannot be ignored on the energy efficiency of the cooperative group are quantitatively analyzed, and the optimal values of all parameters which enable the energy efficiency of the cooperative group to be optimal are derived. Correspondingly, a set of cooperative group managementmechanism is designed in the method, and the whole life cycle of the cooperative group comprises group establishment, group information sharing, group cooperation and group dissociation. According tothe neighbor discovery method, the integrity of the node awakening time table is ensured, and meanwhile, the awakening time slot with low energy efficiency can be effectively reduced.