Tunnel fire-fighting system with valley intermountain water being water source

The invention discloses a tunnel fire-fighting system with valley intermountain water being a water source. The tunnel fire-fighting system comprises a pressure sensor, a wireless alarm device, a drainage ditch, an overflow dam, a sand and gravel trap, a low-level water pool, a pump room, a high-level water pool and a tunnel fire hydrant. The overflow dam, the sand and gravel trap, the low-level water pool, the pump room, the high-level water pool and the tunnel fire hydrant are built nearby a tunnel. Through using the intermountain water as the water source, it can be ensured that stored water in a reservoir is sufficient, and the cost is lowered; the overflow dam is arranged inside the drainage ditch for storing water, so that the intermountain water is conveniently led into the sand and gravel trap. Through arranging the low-level water pool, the pump room and the high-level water pool, water pressure can be automatically provided for the fire hydrant of the tunnel. The pressure sensor is arranged for detecting the amount of sand and gravel in the sand and gravel trap. When the amount of the sand and gravel is excessively large, a wireless alarm signal is transmitted to a control center of the tunnel fire-fighting system so as to remind workers of clearing away the sand and gravel in the sand and gravel trap. In this way, it is avoided that because the amount of the sand and gravel in the sand and gravel trap is excessively large, a pipeline communicated with the low-level water pool is blocked, the low-level water pool can not store water, and no water can be provided for tunnel fire fighting.