Line protection device for installation of tunnel lighting system

The utility model discloses a line protection device for installing a tunnel lighting system, which comprises a tunnel main body, a high-voltage cable is fixedly arranged on the inner wall of one side of the tunnel main body close to the lower end, and a plurality of lighting cables are arranged on the cable body of the high-voltage cable in parallel at equal intervals. A plurality of explosion-proof lamps are fixedly arranged at the center of the top face of the tunnel body at equal intervals, the ends, away from the high-voltage cable, of the multiple lighting cables are connected with the explosion-proof lamps correspondingly, a leakage protector is arranged at the position, close to the upper end, of a cable body of one lighting cable in series, and a photoelectric sensor is fixedly arranged at the lower end of the leakage protector. A limiting sleeve is movably arranged in the middle of a cable body of one lighting cable in a sleeving mode, and connecting plates are fixedly arranged at the front end and