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Aiming at the problems of low efficiency and great potential danger in the field of daily inspection of electric power, the paper puts forward an intelligent solution for the test of high voltage and ultra-high voltage transmission lines. It adopts the method of high-precision UAV platform carrying the self-developed contact and non-contact combined electrical testing device, which can realize the fast acquisition of high-altitude line voltage state. Combined with the end-to-end high reliable wireless transmission, computer digital sampling algorithm and self-developed ground processing software, the system can directly display the line voltage data at the ground remote control terminal. Through the experimental verification, the test accuracy is better than ±10V. The intelligent test system has the advantages of high efficiency, high accuracy and high reliability. It has been applied in many areas, and the test data is accurate and safe to use. The system is convenient and has good effect, so it has the significance of popularization.