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Based on the status of tower crane safety monitoring for construction project, ZigBee technology is applied for tower crane safety monitoring and early warning system, the WSN nodes are designed for displacement, stress and distance monitoring function. Through WSN nodes , field monitoring data are uploaded timely to the monitoring center PC, for real-time display and processing, if the monitoring data exceeds the alarm value, the alarm signal will be sent out immediately, to prevent tower crane accidents effectively, and ensure the safe of crane operation. By the network debugging, the system is stable and reliable performance, data measurement error is less than 5%, transmission distance can reach more than 1000 meters. It has high performance to price ratio and application value.