PURPOSE: A double fire fighting system is provided to remove consecutively exposed residual volatile material and to rapidly suppress a secondary fire. CONSTITUTION: A double fire fighting system comprises: a water tank(100) connected to a valve for direct water supply; a plurality of foam chambers; a first fire pump(103) installed on a first water supply line; spay jet nozzles connected a plurality of foam chambers; a first fire-fighting facility(10) composed of a second water supply line; a tank lorry(112) connected by the first foam supply line and second foam supply line; a second fire pump(113) installed on the first foam supply line; a first storage tank(115) in which one side thereof is connected to the first foam supply line and the other side thereof is connected to the foam chamber; and a second fire-fighting facility(11) consisting of a second storage tank.
