The traditional transmission tower assembly monitoring system has the idle state of data transmission with invalid energy consumption, which makes its life time difficult to meet the engineering needs. Therefore, based on the idea of turning the sensors in the idle time period into low-power sleep state, this paper proposes an M/M/1/N/∞queuing model suitable for data transmission of transmission tower assembly monitoring system, deduces the distribution equation of data transmission in the monitoring system, and determines the corresponding rotation times of data transmission by solving the ratio of mon-itoring data waiting length to effective input rate, The idle time of data transmission of each sensor is determined, and the low-power working mode of turning the sensor in the idle time period into sleep is realized. According to this method, the developed transmission tower assembly monitoring system consumes 24% of power in the 6-day actual monitoring process of Zhouning Ningde 500 kV Line Project, and the endurance time is increased by 1.9 times compared with the traditional method, meeting the engineering demand that the endurance time of the monitoring system is greater than the construction cycle of single base tower assembly.