A structure for supporting a lamp apparatus including a plurality of LED lamps mounted in a main case, a lamp PCB mounted with parts and sockets for operating the LED lamps, a collimate lens connected to a front side of the LED lamps to reflect light by a predetermined angle, a protection board formed at the front side of the collimate lens to protect the LED lamps from contaminants, a cover covering the protection board, being connected to the front of the main case, and a packing material interposed between the cover and the main case, the lamp apparatus supporting structure comprising: a main case mounted with various parts required for the lamp apparatus therein, including a hinge hole formed on a central part of both sides thereof, and a fixing recess formed on the both sides thereof, thereby achieving a 4-point supporting system; a fixing unit for fixing the main case to a roof panel of a heavy equipment vehicle and including a penetration hole and a position controlling slit respectively corresponding to the hinge hole and the fixing recess of the main case, wherein the fixing unit comprises a center supporter having two ends and fixable to the roof panel of the vehicle; a side supporter vertically extended upward from both ends of the center supporter and brought into close contact with lateral sides of the main case, including a penetration hole corresponding to the hinge hole and a position controlling rib extended rearward from upper parts of the side supporters and each formed with the position controlling slit in the center thereof; a hinge bolt fastening lever including a hinge bolt formed on the front side thereof to connect the main case to the fixing unit in a hinged manner,; and a fixing bolt fixing both sides of the main case to the fixing unit through the position controlling slits of the fixing unit to have a predetermined illumination angle; characterized in that: the center supporter comprises a connection rod formed with a male screw thread on an outer circumference thereof to be fixed to the roof panel, and a nut and the hinge bolt fastening lever further comprises outer circumferential recesses and a connection screw brought into close contact with any one outer circumferential recess of the hinge bolt fastening lever, said connection screw being connected with a connection hole of the fixing unit, thereby preventing rotation and separation of the hinge bolt fastening lever. a main case mounted with various parts required for the lamp apparatus therein, including a hinge hole formed on a central part of both sides thereof, and a fixing recess formed on the both sides thereof, thereby achieving a 4-point supporting system; a fixing unit for fixing the main case to a roof panel of a heavy equipment vehicle and including a penetration hole and a position controlling slit respectively corresponding to the hinge hole and the fixing recess of the main case, wherein the fixing unit comprises a center supporter having two ends and fixable to the roof panel of the vehicle; a side supporter vertically extended upward from both ends of the center supporter and brought into close contact with lateral sides of the main case, including a penetration hole corresponding to the hinge hole and a position controlling rib extended rearward from upper parts of the side supporters and each formed with the position controlling slit in the center thereof; a hinge bolt fastening lever including a hinge bolt formed on the front side thereof to connect the main case to the fixing unit in a hinged manner,; and a fixing bolt fixing both sides of the main case to the fixing unit through the position controlling slits of the fixing unit to have a predetermined illumination angle; characterized in that: the center supporter comprises a connection rod formed with a male screw thread on an outer circumference thereof to be fixed to the roof panel, and a nut and the hinge bolt fastening lever further comprises outer circumferential recesses and a connection screw brought into close contact with any one outer circumferential recess of the hinge bolt fastening lever, said connection screw being connected with a connection hole of the fixing unit, thereby preventing rotation and separation of the hinge bolt fastening lever. the center supporter comprises a connection rod formed with a male screw thread on an outer circumference thereof to be fixed to the roof panel, and a nut and the hinge bolt fastening lever further comprises outer circumferential recesses and a connection screw brought into close contact with any one outer circumferential recess of the hinge bolt fastening lever, said connection screw being connected with a connection hole of the fixing unit, thereby preventing rotation and separation of the hinge bolt fastening lever.