Abstract: Due to environmental factors and operational conditions of transmission lines, the temperature measurement results of tension clamps on transmission lines have significant errors, which affects the safe and stable operation of the power systems. Therefore, a temperature measurement method for transmission line tension clamps based on pyroelectric infrared sensors is proposed. A temperature measurement device architecture incorporating pyroelectric infrared sensor is designed, using an LPC2123 microcontroller as the microprocessor, which is mounted on the tension clamp. The process of high-voltage electric field induction power generation is analyzed, and the high-voltage electric field power generation method at the temperature measurement end is optimized. After completing those optimization design, the pyroelectric infrared sensor is calibrated using a Back Propagation (BP) neural network. The temperature measurement of the transmission line tension clamp is completed according to the designed temperature measurement steps. The experimental results show that the deviation of the proposed method is less than ±1℃ at -40~140℃, exhibiting good temperature uniformity and environmental adaptability. Under the influence of wind, rain, snow and other meteorological factors, the error of temperature measurement results obtained by the proposed method can still be controlled within 2℃, which fully verifies that the proposed method can accurately and reliably measure the temperature of transmission line tension clamp by using pyroelectric infrared sensors with superior measurement performance.