The invention discloses an aluminum cell, and particularly relates to a method for greatly reducing a horizontal current in aluminum liquid of the aluminum electrolytic cell. The method comprises the following steps of: fixedly binding or casting at least one cathode steel bar at the lower part of a cathode carbon block; dividing one section of the cathode steel bar, which is close to the end part of the cathode carbon block along the length direction, into an upper part and a lower part by a separation seam; connecting the section of the cathode steel bar, which is not divided at the middle part of the cathode carbon block, by adopting a conductor and the cathode carbon block; connecting the upper part of the cathode steel bar, which is close to the end part of the cathode carbon block, by the conductor and the cathode carbon block, and isolating the lower part of the cathode steel bar from the cathode carbon block through an insulator; filling a separation seam insulating material in the separation seam so that the upper part and the lower part of the cathode steel bar are insulated; and leading the entire body of the cathode steel bar to pass through the side part of the electrolytic cell. With the method provided by the invention, the horizontal current in the aluminum liquid is greatly reduced, the distribution of a cathode current is more uniform, the stability of the electrolytic cell is improved, the service life of the cell is prolonged, and the aluminum energy consumption per ton is effectively reduced, so that the method has obvious energy-saving effects.