The invention discloses a gas baking method and device for an aluminium electrolysis cell. The method comprises the following steps of: heating a cell cavity to 900 DEG C, and directly pouring electrolyte into the cell cavity for starting; in the heating process of the cell cavity, dividing the cell cavity of the electrolysis cell into a plurality of areas, respectively arranging controlled burners at multiple spots of each area, wherein the controlled burners are uniformly distributed and are arranged under the bottom palm of the positive pole of the big surface of the aluminium electrolysis cell in a staggering mode, and controlled draught flues are respectively arranged in the central joint of the cell cavity and at multiple spots of the side surface of the cell cavity so as to reduce the temperature difference between all the areas; and in the baking process, controlling the ratio of the gas to the air to be less than 1:3, and preventing carbon blocks from oxidizing in a controlled oxygen deprivation combustion mode. The device comprises the plurality of controlled special-shaped burners and the controlled draught flues, wherein the controlled special-shaped burners are uniformly distributed and are arranged under the bottom palm of the positive pole of the big surface of the electrolysis cell in a staggering mode, and the controlled draught flues are arranged in the central joint of the cell cavity and at the multiple spots of the side surface of the cell cavity. The invention is beneficial to the uniform heating of the cell cavity, reducing of the temperature difference between all areas and the oxidation of the carbon blocks in the baking process.