The invention provides a cold-resistant
water based fire extinguishing agent suitable for the temperature from minus 40 DEG C to55 DEG C. The cold-resistant
water based fire extinguishing agent comprises, by weight percentage, 15-25% of a
flame retardant, 25-35% of
antifreeze, 2-2.5% of a surfactant and the
balance water. The invention further provides a preparation method of the fire extinguishing agent. The preparation method comprises the steps that water is heated to 30-50 DEG C, the
antifreeze, the
flame retardant and the surfactant are added in sequence, the solution temperature is kept in the range of 30-50 DEG C, all the raw materials are mixed until completely dissolved, the raw materials are cooled to the
room temperature, and the cold-resistant
water based fire extinguishing agent is obtained. The components of the fire extinguishing agent are uniformly mixed, and the fire extinguishing effect is not influenced after the long-time storage; and the fire extinguishing agent can be directly used without being mixed with water, the applicable temperature can reach minus 40 DEG C and can be as high as 55 DEG C, the applicable temperature range is wide, the fire extinguishing effect is good, and the range of the variety is wide; the fire extinguishing agent is free of
toxin and stimulation and has the great
flame resistance and reflashing resistance, and 6L of the fire extinguishing agent can reach the fire extinguishing levels of 2A and 89 B; the fire extinguishing speed is high, only 20-40 seconds are needed, the 100%
biodegradation can be achieved after spraying, and the cold-resistant water based fire extinguishing agent is an environmental-friendly fire extinguishing agent and is easy to clean after fire extinguishing.