The present invention relates to a power cable design method, comprising: presetting a unique identifier according to a characteristic of a power cable; Receiving electrical characteristics of a predetermined electric device from a user; Receiving an installation condition of the electric device; Receiving a unique identifier of a predetermined power cable; Extract electrical characteristics of the power cable corresponding to the inputted unique identifier, calculate and display the current characteristic value and the voltage drop value when the power cable is connected under the electrical characteristics and installation conditions of the electrical apparatus according to a preset calculation formula Characterized in that it comprises a step. Accordingly, the present invention makes it easy to check the current characteristics and the voltage drop characteristics according to the design value of the power cable by using software, so that the characteristic value change value according to the power cable change can be immediately calculated to power cable design process It can not only improve the efficiency, save the manpower required, but also minimize the calculation errors.
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