The invention discloses a method for carrying out welding repair on a welding seam containing cracks. The method comprises the steps of polishing a welding seam part so as to remove part of cracks andretain cracks hard to remove by polishing; fusing and sealing the remained cracks of the welding seam part; and carrying out welding repair on the welding seam part. The welding repair method provided by the invention solves the problem that welding repair is hard to carry out since the remained cracks hard to remove exist on the welding seam part, and make the welding repair carried out under the condition that the remained cracks hard to remove exist on the welding seam part possible.