A pedestrian warning device of a vehicle is disclosed. The pedestrian warning device includes a pedestrian detector configured to detect a position of a pedestrian walking around a vehicle, an in-vehicle warning sound outputter configured to output warning sounds through a plurality of internal speakers arranged at different positions in the vehicle, and a controller configured to generate pedestrian movement information including a movement direction of the pedestrian based on the detected position of the pedestrian, determine a moved position of the pedestrian based on the generated pedestrian movement information, control an operation of the in-vehicle warning sound outputter according to the determined moved position to operate an internal speaker corresponding to the moved position of the pedestrian among the plurality of internal speakers as the pedestrian moves, and notify a driver of the moved position of the pedestrian by change of a direction of the output warning sound.
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