The invention provides an electric kettle comprising an inner container (10) used for holding liquid, a heating device (20) used for heating the liquid, a temperature sensor (30) used for measuring the temperature of the liquid, and a control board (40) which is electrically connected with the temperature sensor (30) and the heating device (20) and is used for adjusting the power of the heating device (20) according to the temperature of liquid. The electric kettle has the advantages that when the temperature of liquid increases, the control board (40) can reduce the power of the heating device (20) gradually, so that liquid can be boiled slowly and liquid can be prevented from boiling fiercely and ejecting out and hurting people; overheat of the heating device (20) caused by long time high-power work can be prevented; the safety of the electric kettle is improved and the service life of the electric kettle is prolonged.