Abstract: This paper introduces the application of ZigBee wireless network in the reconstruction project of the power parameter monitoring system of an old building. Through ZigBee wireless network, the power consumption of the low-voltage outlet cabinet of the substation and distribution station in the building, as well as the power consumption of each distribution box such as the air conditioning room, boiler room, water pump room, distribution room (electric well) are monitored in real time, so as to master the power consumption of each electrical equipment (or system) in the building, so as to provide data support for the energy-saving control of the building. The wireless network simplifies the terminal system wiring, has high real-time performance and reliability, and is suitable for old building reconstruction projects, which has a certain application value.