With the increase of urban development and energy demand, the electromagnetic influence of overhead alternating current (AC) transmission lines on buried steel pipelines is becoming more serious. Traditionally, the coupling voltage calculation methods mainly include electromagnetic simulation and calculation using earth loop equivalent model, which are complicated and time-consuming to get the pipeline coupled voltage. So, a method for calculating the coupled voltage on pipelines nearby the overhead transmission lines is proposed. Firstly, a calculation model for the unit-length pipeline coupling voltage under multiple factors is established. Secondly, by discussing the offset effect of insulation connection and pipeline breakage on the lowest point of inductive coupling voltage, the calculation method of the lowest point is given to determine the distribution form of pipeline coupling voltage. Finally, the calculation method of coupled voltage based on the increment of inductive coupling voltage per unit length pipeline and the distribution of coupling voltage is proposed. The example analysis shows that the error is less than 10% compared with simulated value and the measured value, and the coupling voltage can be reasonably calculated.