Rang hood with automatic ON function

The invention provides a range hood with an automatic ON function. The center position of the range hood is provided with a gas sensor; when gas is detected by the gas sensor, the range hood is triggered to turn on automatically; and in this way, the gas does not accumulate so that risks are avoided. 本发明提供种可自动开启的抽油烟机，所述的抽油烟机的中间处设有个气体传感器，当传感器检测到有气体时，就会自动触发开启抽油烟机工作，这样燃气就不会聚集，以免发生危险。