The invention provides a low power consumption parking management system based on a wireless sensor network, and wireless network nodes, wherein the parking management system includes a display control device, a guide device and wireless network nodes. The wireless network nodes work based on three modes, namely a high energy consumption detection mode, a low energy consumption sleep mode and a monitoring mode. Every wireless network node is responsible for the management of the corresponding stall, a plurality of wireless network nodes constitute an area, each area has one wireless network node serving as the monitoring node which work in the monitoring mode, other wireless network nodes serve as detection nodes which all work in a high energy consumption detection mode or all work in a low energy consumption sleep mode. Due to the adoption of the wireless network nodes with the three working modes, the detection and the monitoring of the stalls can be realized, data about left available stalls can be updated in a real-time manner in the display control device, and the guide device is controlled to guide vehicles into the left available stalls. Therefore, the stalls can be completely managed.