In this paper, the induced overvoltage of the non-vertical lightning channel on the overhead line in the presence of ocean-land mixed propagation is investigated. The lightning-induced voltage was evaluated by using a full-wave approach based on the Finite Element Method (FEM) to solve the Maxwell equations. The influence of channel inclination, strike location (ocean or land), overhead line distance from ocean-land interface, and return stroke current waveform on the induced voltage waveform, the peak of the induced voltage, and voltage profile along the line is investigated. The induced voltage is significantly impacted by the channel inclinations angles, strike location, and distance between line and ocean-land interface. As the overhead line gets closer to the ocean, the induced voltage of the inclined channel in the middle point of the line will be decreased in comparison to the cases the line is far from the ocean. If the inclined lightning passes above the line, increasing the inclination angle will significantly increase the peak and decrease the rising and settling time of the voltage waveform.