A lighting device equipped at all times in a vehicle, which is used for camping and leisure and has vehicle safety warning light and fire detection functions, the lighting device comprising: a fixing plate having a rectangular shape, and provided with a pair of first magnet members which are disposed on right and left sides of the fixing plate; a first detection sensor provided on a lower front surface of the fixing plate; a "C"-shaped front insertion groove formed in a front surface of the fixing plate while being adjacent to edges of the fixing plate excluding an upper edge of the fixing plate; a "C"-shaped first support member selectively fixed to the front insertion groove and rotatable toward a front side of the fixing plate through a hinge; a pair of side insertion grooves formed vertically on both sides of the fixing plate; a pair of second support members respectively coupled to insides of the side insertion grooves through a hinge, and unfolded in a direction opposite to the first support member; a light unit provided on a rear surface thereof with a second magnet member detachably attached to the first magnet member, accommodated therein with a battery, and provided on a front surface thereof with an illumination device; a second detection sensor provided on an upper rear surface of the light unit, and activated by approaching the first detection sensor when the light unit is vertically inverted and attached to the fixing plate by a user; a fire detection sensor provided on an upper surface of the light unit, operated only when the second detection sensor is in an activation state, and activated when a fire is detected; a buzzer provided on the upper surface of the light unit, and activated when the fire detection sensor is activated; and a cover rotatably coupled to the light unit through a hinge to selectively cover the illumination device, wherein the illumination device flickers when the illumination device is covered by the cover. a fixing plate having a rectangular shape, and provided with a pair of first magnet members which are disposed on right and left sides of the fixing plate; a first detection sensor provided on a lower front surface of the fixing plate; a "C"-shaped front insertion groove formed in a front surface of the fixing plate while being adjacent to edges of the fixing plate excluding an upper edge of the fixing plate; a "C"-shaped first support member selectively fixed to the front insertion groove and rotatable toward a front side of the fixing plate through a hinge; a pair of side insertion grooves formed vertically on both sides of the fixing plate; a pair of second support members respectively coupled to insides of the side insertion grooves through a hinge, and unfolded in a direction opposite to the first support member; a light unit provided on a rear surface thereof with a second magnet member detachably attached to the first magnet member, accommodated therein with a battery, and provided on a front surface thereof with an illumination device; a second detection sensor provided on an upper rear surface of the light unit, and activated by approaching the first detection sensor when the light unit is vertically inverted and attached to the fixing plate by a user; a fire detection sensor provided on an upper surface of the light unit, operated only when the second detection sensor is in an activation state, and activated when a fire is detected; a buzzer provided on the upper surface of the light unit, and activated when the fire detection sensor is activated; and a cover rotatably coupled to the light unit through a hinge to selectively cover the illumination device, wherein the illumination device flickers when the illumination device is covered by the cover.