Overall length correcting method for stamping product

The invention discloses an overall length correcting method for a stamping product. The overall length correcting method comprises the following steps: step 1, enabling a stripping plate on a formingproduct mould to form an upper convex point at the lower side of the stripping plate, and enabling a lower mould on the forming product mould to form a lower convex point which is positioned at the upper side of the lower mould and is positioned below the upper convex point; step 2, arranging the forming product mould with the upper convex point and the lower convex point on a punch, and stampingand debugging; and step 3, starting the punch for enabling the mould to punch a material strap to form the stamping product, enabling the upper convex point and the lower convex point to match with each other up and down for extruding the stamping product to form an extending region, wherein transverse length of the extending region is affected by protrusion height of the upper convex point and the lower convex point, so t