A lightning protection device includes a carrier module and a transmission module. The carrier module includes a housing unit defining an accommodating space and having a plurality of spaced-apart first vents and a plurality of spaced-apart fixing portions. An ion generating unit is disposed in the accommodating space for generating positive and negative ions. The transmission module includes a plurality of transmission units each including a transmission lever that has a lower end, an upper end, and a guide groove extending from the lower end to the upper end for guiding and diffusing the positive and negative ions generated by the ion generating unit to move toward the direction of the upper end, and a sensing probe connected to the upper end.