The monitoring system of tower tilt in icing region existing has the disadvantage that detection means single, low automation, detecting poor and unable to provide advanced warning. This has seriously affected on the timeliness and accuracy of tilt detection of transmission tower, it planted a huge hidden danger for tower collapses in icing area. In view of this problem, this paper designed an online monitoring system of icing region tower tilt based on ZigBee. The system uses the tilt angle sensor and force sensor as the gist to detect and provide early warning, ZigBee sensor network as the means to data interaction, GPRS technology for remote data transmission and solar panels provide energy sources. The system realized real-time online monitoring and early warning for tower tilt in icing region and has a certain role in prevention tower collapses of transmission tower.