Abstract: A new type of power supply appeared in the power monitoring systems, which attach a magnetically coupled resonant wireless power transmission (MCR-WPT) coil on an insulator to supply power. The working insulator with MCR-WPT (energy-transmitting insulator) will cause temperature rising, and the excessive temperature will affect the safe operation of the power system seriously. Aiming at the temperature rise of the energy-transmitting insulator, the energy transmission characteristics of the energy-transmitting insulator and its temperature change characteristics are analyzed under different electrical input power and meteorological environments by using multiphysics calculation software in the article. The research result shows that: in environment 1 or environment 2, when the system's electrical input power reaches 30 W, the energy transfer insulator transmission performance still remains at around 65%.The experimental result shows that the simulation and experimental values are basically consistent, and when the experimental environment is 25.2 ℃, and output power is 6.5 W, the energy-transmitting insulator is continuously operated for 25 minutes, and the maximum surface temperature is increased by about 3 ℃.