An intelligent kitchen ventilator comprises a temperature sensor, a humidity sensor, a smog sensor and a gas sensor which are arranged below a kitchen ventilator body. The temperature sensor, the humidity sensor, the smog sensor and the gas sensor are connected with a controller on the front face of the intelligent kitchen ventilator body. The controller is connected with a motor and an alarm. Temperature and humidity data above a gas appliance is obtained through the temperature sensor and the humidity sensor, smog data above the gas application is acquired through the smog sensor, and gas leakage data is acquired through the gas sensor. The controller analyzes the smog data and the gas leakage data, and therefore the kitchen ventilator is automatically started or switched off, and the controller gives an alarm to the old for prompting through the alarm when an accident situation occurs.