The present invention relates to an adaptive beacon cigarette lighter plug device. The adaptive beacon cigarette lighter plug device according to the present invention, which is a cigarette lighter plug device owned by a user, includes a body insertion unit having a body structure to be inserted into a cigarette lighter receptacle of a vehicle, a power supply unit configured to receive power from the vehicle through the cigarette lighter receptacle when the body insertion unit is inserted into the cigarette lighter receptacle of the vehicle, a power conversion unit configured to convert the power received from the vehicle into at least one type of designated operating power; a universal serial bus (USB) connector unit including a USB connector configured to apply USB power converted by the power conversion unit to the outside; a power charging unit configured to charge at least power supplied through the power supply unit and/or power converted by the power conversion unit; and a beacon module configured to operate with vehicular power supplied from the vehicle when it is confirmed that the body insertion unit is inserted into the cigarette lighter receptacle of the vehicle and the vehicular power is being supplied from the vehicle through the power supply unit or operate with power charged in the power charging unit when it is not confirmed that the vehicular power is being supplied from the vehicle, process at least one type of bidirectional data communication including bidirectional Bluetooth data communication with a paired user terminal when a Bluetooth function of the user terminal is activated, and broadcast at least one Bluetooth-based beacon signal using the vehicular power or the charged power.
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