The invention discloses an alternating and direct current resistance ratio determination method of a layered insulated conductor and a current-carrying capacity evaluation method of a layered insulated conductor cable. Through a study on the linear relation existing between Sr and k of conductor samples with other structures, the k value of a layered insulated conductor can be reversely calculated according to the measurable and calculable Sr of the layered insulated conductor, so that the alternating and direct current resistance ratio calculation of the layered insulated conductor andcurrent-carrying capacity evaluation can be realized. The determination method can be used for the alternating and direct current resistance ratio calculation of the layered insulated conductor, and is convenient and fast in calculation, so that theoretical bases can be provided for the optimization design and performance checking of the layered insulated conductor; and current-carrying capabilityevaluation can be performed on a layered insulated conductor cable, so that the accuracy of current-carrying capacity calculation results can be guaranteed, and power transmission costs brought by current-carrying capacity deviation during the application of the conductor can be reduced.