The utility model discloses a tunnel firefighting system using tunnel surged water as a water source. The tunnel firefighting system is characterized by comprising a seepage pipe, a center drainage ditch, a side ditch, a transverse drainage pipe, a sand sediment trap, a low-level water pool, a pump room, a high-level water pool and a tunnel fire hydrant, wherein the sand sediment trap, the low-level water pool, the pump room, the high-level water pool and the tunnel fire hydrant are built near a tunnel. Through using the tunnel surged water as the water source, the water can be conveniently taken, a water taking facility is simple, and the cost is lowered; through arranging the low-level water pool, the pump room and the high-level water pool, water pressure can be automatically provided for the tunnel fire hydrant.