The invention discloses a method for manufacturing the metal strip (1). The metal strip is provided in the method. The metal strip comprises at least two parts which are welded on two welding seams. The method comprises the step of performing transverse grinding which is perpendicular to the vertical direction and then performing vertical grinding on the welding seam along the longitudinal direction. Besides, the invention relates to metal strip (1) which is manufactured according to the above method. At last, the invention relates to the device for implementing the provided method.
