An apparatus for locating inferior parts in distribution line equipment may include a wireless noise receiver for continually receiving multiple noise-free frequencies and converting the received multiple noise-free frequencies into an audio frequency signal, a signal processor for quantifying a power frequency and harmonic frequencies of the audio frequency signal, a signal analyzer for calculating variation of the power frequency and the harmonic frequencies, determining the number of changed frequencies based on the calculated variation, detecting a radio frequency noise signal generated from an inferior part based on the calculated variation and the number of changed frequencies, and a frequency calibrator for determining a noise-free band, selecting the multiple noise-free frequencies from the noise-free band, and managing a list of the selected multiple noise-free frequencies.