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In order to solve the problem that harmonic canpsilat be measured directly in high voltage power lines presently, a wireless detection method based on field intensity method is proposed. Through theoretical analysis, building the mathematical model of field intensity and voltage difference between two points around high voltage power lines and using Matlab software to simulate field intensity, the method was proved correctly. On the basis of this theory, a scheme was presented, using field intensity method and wireless ways to get voltage signals from high voltage power lines directly, and a laboratory prototype was also designed. This prototype is composed of a sending device with DSP as itpsilas core and a receiving device with CPU as itpsilas core. The simulation and experimental results shows that the wireless harmonic detector of high voltage power network based on field intensity method can detect harmonic from high voltage power lines directly and effectively.