The invention relates to a measurement method for alternating-current resistance of a cable conductor. The method comprises the following steps: applying large current to a conductor loop by adopting a voltage regulator and a straight-thought transformer; after the temperature of the conductor is stable by long-time current heating and temperature raising, synchronously measuring voltage and loop current in one section of the conductor and the surface temperature of the conductor; extracting amplitudes and phases of voltage and current signals by Fourier transformation, and calculating a phase difference between the voltage and the current; finally, calculating the alternating-current resistance of the conductor by adopting a formula. The method is high in measurement precision, good in stability, good in consistency of repeated measurement, simple in structure and convenient to measure, and is particularly suitable for measuring the alternating-current resistance of the cable conductor with a large section.