Method for repairing main shaft cracks of continuous kneader

The invention discloses a method for repairing main shaft cracks of a continuous kneader. The method comprises the following steps of: treating the end parts of the main shaft cracks of the continuous kneader in a way of drilling hole and polishing; and then controlling the temperature of a welding process, and welding after the heating temperatures of a crack welding area and a crack repair welding area reach the working temperature, namely 200 DEG C, of a big shaft of the continuous kneader, wherein tungsten electrode inert gas protection weld is adopted in the welding process. The method is convenient and feasible and saves the cost of spare parts of the main shaft of the continuous kneader.