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 (S1) 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 (S2) provided on an upper rear surface of the light unit , and activated by approaching the first detection sensor (S1) when the light unit is vertically inverted and attached to the fixing plate by a user; a fire detection sensor (S3) provided on an upper surface of the light unit , operated only when the second detection sensor (S2) is in an activation state, and activated when a fire is detected; a buzzer (B) provided on the upper surface of the light unit , and activated when the fire detection sensor (S3) 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 (S1) 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 (S2) provided on an upper rear surface of the light unit , and activated by approaching the first detection sensor (S1) when the light unit is vertically inverted and attached to the fixing plate by a user; a fire detection sensor (S3) provided on an upper surface of the light unit , operated only when the second detection sensor (S2) is in an activation state, and activated when a fire is detected; a buzzer (B) provided on the upper surface of the light unit , and activated when the fire detection sensor (S3) 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 . <EOS>