The invention discloses a wireless network monitoring system. The wireless network monitoring system comprises a hardware portion and a control system. The hardware portion comprises a camera, a video encoder, a video decoder, a wireless network bridge, a monitoring center, a switch and a mentoring host. According to the invention, by use of a fault tolerance transmission technology and an intelligent storage technology, a human activity model and a video database are established, at the same time, the system employs a wireless network access technology, an area intrusion detection technology, a warning line crossing detection technology, a video diagnosis technology, a multi-behavior analysis technology, a video diagnosis technology and an RS485 technology, and the system has the advantages of high function extensibility, reliable and stable performance, simple operation, convenient use and the like.