The invention relates to a fire extinguishing agent using amount screening method for extinguishing a lithium ion battery fire. The method comprises a method for determining the using amount of a fireextinguishing agent for a battery fire and a method for estimating the using amount of a fire extinguishing agent in a protection area. In the case of the method for determining the using amount of the extinguishing agent for the battery fire, the amount of the fire extinguishing agent which is needed in the unit volume space to be used for extinguishing the battery fire and making the temperature of the surface of a battery reach the expected temperature after the fire is extinguished is obtained through experiments. In the case of the method for estimating the using amount of the extinguishing agent in the protection area, the using amount of the extinguishing agent for the whole protection area is extrapolated through the using amount of the extinguishing agent for the battery fire. The method for determining the using amount of the fire extinguishing agent for the battery fire comprises the steps of single battery fire extinguishing experiment, data fitting, determination of the expected using amount of the fire extinguishing agent, determination of theoretical using amount of the fire extinguishing agent for single battery fire extinguishing and the like. According to the fire extinguishing agent using amount screening method for extinguishing the lithium ion battery fire, the using amount of the fire extinguishing agent which is used for extinguishing the battery fire and making the temperature of the surface of the battery reach an expected value in a certain space volume can be screened out through the experiments, and then reference is provided for the fire-fighting design of a new energy automobile using a lithium ion battery energy storage system and the fire-fighting design of an electrochemical energy storage power station.