Method for detecting node attack in wireless sensor network

The invention provides a method for detecting node attack in a wireless sensor network, belonging to the application field of wireless sensor network and information security cross technology. The invention is characterized in that the method comprises the following steps: the wireless sensor network is divided into four allocation area steps; nodes and allocation areas are numbered to a corresponding mapping relation table, and the nodes are allocated to the corresponding area steps; a node broadcast ID (identity) and area numbers are fed back by the broadcasted node, the received broadcasted node is taken as a neighbouring node, and the ID and the area number for the neighbouring node are recorded in a neighbouring list step; the nodes check the area numbers of all neighbouring nodes in the neighbouring list to form a border area or border area numbers; the border area and four initialized allocation areas form new allocation areas; when the node area numbers change, the neighbouring broadcast ID and the new area are numbered, and the received broadcasted nodes modify the area numbers of the corresponding neighbouring nodes in the neighbouring list to form the wireless sensor network steps with new cells; addition of new nodes is the secondary detection step for replication nodes. The method has the advantages that any auxiliary equipment is not required, the energy consumption is low, the efficiency is high, and the method is easy to realize.