The invention discloses a deep-well garage fine water spray fire fighting system. The deep-well garage fine water spray fire fighting system comprises a power distribution control system, a water supply system, a high-pressure pump unit system, a thermal inductance and smoke induction system, a pipe network system and a fine water spray system, wherein the power distribution control system, the water supply system, the high-pressure pump unit system, the thermal inductance and smoke induction system, the pipe network system and the fine water spray system are connected in a coupling manner insequence. The fine water spray system is arranged in a deep-well garage in a covering manner, and comprises a plurality of fine water spray nozzles. Corresponding fine water spray nozzles are arrangedon each stall of the deep-well garage at the adjacent positions on the upper part and the lower part, and the adjacent positions on the left part and the right part. The fine water spray nozzles arearranged on the left face and the right face, which are opposite, of the deep-well garage alternatively in the depth direction of the deep-well garage. The deep-well garage fine water spray fire fighting system can evenly spray fine water spay to the whole protected area (deep-well garage) to protect all the protected objects (vehicles) in the protected area, achieves the effects of surface cooling, suffocation, radiant heat obstruction and soaking, achieves the purposes of controlling a fire, inhibiting a fire and putting out a fire, and is friendly to the environment without toxin or pollution.