Metal plate stamping device

The invention relates to the technical field of automobile sheet metal part machining, and discloses a metal plate stamping device. The metal plate stamping device comprises a steel plate die, a bracket assembly and a supporting and positioning piece, wherein the steel plate die is used for blanking a metal plate; the bracket assembly extends from the steel plate die to the outside of the steel plate die; the supporting and positioning piece is adjustably connected to the bracket assembly and used for positioning and supporting the metal plate; and the bracket assembly and the supporting and positioning piece jointly act to position the metal plate to a station at which the steel plate die conducts blanking on the metal plate. According to the metal plate stamping device, the problem that the scheme that a punching part with a newly-added hole is additionally arranged on an existing mass production die is not feasible is solved, and the mode that a casting die with high manufacturing cost and long period is u