The invention, which is applicable to civil security and surveillance and military intrusion detection, relates to a wireless network system for monitoring, identifying and judging the pathway of an intruding target by setting up a plurality of nodes. The intruding target can be located, identified and tracked by carrying out the extraction, analysis and data integration on the signal characteristic quantity of the sensors at each monitoring node, moreover, the function for a user to set sensitive areas is served, so that various alarm signals can be sent according to the closeness of the intruding target to the sensitive areas. Additionally, a monitoring sensor at the monitoring node is used for generating sleeping and waking-up signals on a real-time basis, thus achieving the deep sleeping and waking of the processor and the communication module and achieving the purpose of saving the energy of the monitoring nodes and guaranteeing that the target intruding the monitoring area can be reliably monitored at the same time. The invention has the characteristics of low cost, low power consumption, flexible arrangement and high applicability and overcomes the defects that the conventional video monitoring method for monitoring the intrusion has complex installation, poor concealment, vulnerable circuit and limited monitoring range and requires artificial event discrimination.