Often the kitchen fire is caused by negligence of human error from improper cooking and unattended stove fire; and putting out flammable liquid by water is inappropriate. Kitchen Defender allows user to use existing water pipeline to install the faucet fire-extinguishing system easily; when it happened to an outbreak of fire, its detection system will be activated to spray fine water mist to isolate the fire source and oxygen that can control the fire, cool the temperature and extinguish the fire. The existing products are difficult for installation for they need another water pipeline installation and extra space; their application to ordinary family is not easy. Kitchen Defender is featured with ease installation and fine water mist technology that puts out the fire source of flammable liquid by isolating the oxygen; it secures the home safety.