Provided is a fire-fighting system that has a very simple structure with only a hose and a water discharge nozzle mounted on a vehicle, can bring the vehicle close to the fire site by automatic operation or remote control, and minimizes the occurrence of a water hammer when water is supplied. A hose reel is installed on a base which is installed on a vehicle, so as to be rotatable around a rotary shaft extending vertically, a hose having shape retaining property is spirally wound around the hose reel and around the rotary shaft, the lower end of the hose is connectable to a water discharge pump installed behind the vehicle, and the upper end of the hose passes through the rotary shaft of the hose reel and is connected to a water discharge nozzle installed at the upper position of the vehicle.