The invention discloses a metallized thin film slitting mechanism which comprises a slitting knife assembly and a movable positioning mechanism, wherein the movable positioning mechanism is positioned below the slitting knife assembly, and used for providing accommodating spaces for the knife heads of slitting knives in the slitting knife assembly; a thin film is conveyed between the slitting knife assembly and the movable positioning mechanism; the slitting knife assembly comprises the slitting knives, horizontal direction adjusting mechanisms and swinging mechanisms; the horizontal direction adjusting mechanisms are used for adjusting the left-right moving of the slitting knives; and the swinging mechanisms are used for adjusting the up-down swinging positions of the slitting knives. The metallized thin film slitting mechanism disclosed by the invention has the advantages that the operation is convenient; the knife heads and shafts are effectively prevented from sliding relative to each other; the thin film slitting width is flexible to adjust and diversified; and the rotary angles of the slitting knives are precise.