The invention relates to a repairing method for the sideways furnace wall of an electrolytic cell, and relates to the technical field of electrolytic cell repairing. The repairing method comprises the steps of firstly, adjusting the height of the electrolyte to be 15-16 cm, and lowering the anode corresponding to the sideways furnace wall to be repaired to the cathode below; using a crusting material block for pressing the bedding face, and isolating the aluminum water from the pot shell of the sideways furnace wall; cleaning residual silica bricks on the sideways furnace wall, taking an aluminum plate as a model, and enabling a gap encircling the repairing position to be formed between the surface of a crusting layer and the pot shell; tamping a carbon paste at the repairing position in the gap until the repairing position is located in the same horizontal position with the other silica bricks; and finally raising the anode. According to the repairing method for the sideways furnace wall of the electrolytic cell, the repairing effect is good, cracks are prevented from generation, the aluminum water does not need to be pumped, and the normal operation of the electrolytic cell is not influenced.