The invention discloses a tunnel fire-fighting system based on a track and an operation method thereof. The system comprises a water supply track and fire-fighting equipment; the method comprises thesteps that S1, a second controller controls a movement mechanism to move and opens or closes a second control valve, and a water level sensor monitors a water level of water in a water storage mechanism in real time and sends the water level to the second controller; S2, when judging that the water level reaches a preset minimum threshold value, the second controller controls a label recognizer torecognize a location label on the water supply track, when label information is received, S3 is executed; S3, the second controller controls the movement mechanism to stop; the second controller controls the opening of a first control valve and sends a first trigger signal to a first controller, and the first trigger signal internally carries the label information; S4, when judging that the waterlevel reaches a preset maximum threshold value, the second controller sends a second trigger signal to the first controller; and S1 is executed. The tunnel fire-fighting system based on the track andthe operation method thereof have the advantages that the fire-fighting disaster in a tunnel can be prevented and controlled, and water can be supplied to the fire-fighting equipment conveniently intime.