The invention provides an electric oven and an intelligent work time adjusting method thereof based on pressure changes. The method comprises the steps that a pressure sensor obtains pressure of a chamber of the electric oven; the steam temperature that can be actually reached corresponding to pressure in the chamber of the electric oven is obtained according to a preset pressure and steam temperature comparison table; whether the steam temperature that can be actually reached corresponding to the pressure of the chamber of the electric oven is lower than the preset temperature field temperature is judged; work time of heating tubes is prolonged dynamically if the steam temperature is lower till the electric oven chamber temperature acquired by a temperature sensor reaches the preset temperature field temperature. Through the means, the heating tubes can be controlled intelligently to work for temperature compensation when the steam temperature that can be actually reached corresponding to the pressure of the chamber of the electric oven is lower than the preset temperature field temperature, and therefore the expected steaming and baking temperature can be reached whether the electric oven is used in areas of any elevation.