Electrolytic tank capable of greatly reducing horizontal current

The utility model discloses an electrolytic tank capable of greatly reducing horizontal current, which comprises anode carbon blocks (1), cathode steel bars (2), a hearth (3), cathode carbon blocks (4) and the like. The electrolytic tank is characterized in that the cathode steel bar (2) is in a 'gradual-change type' cathode bundling and pasting structure, namely a cathode bundling and pasting structure with an inclined surface or a step type section, high-temperature-resistant insulating materials are filled on the inclined surface or the step type section, the cathode steel bars (2) are proportionally arranged in the cathode carbon blocks (4), the width S of a large processing surface (5) in the hearth (3) is controlled to range between 240mm to 269mm, and the cathode carbon blocks (4) are aligned with the anode carbon blocks (1), namely, the width of each cathode block is equal to that of each anode carbon block and ranges from 600mm to 800mm.