A disc tumbler cylinder lock, and characterized in that the disc tumbler cylinder lock comprises: a lock sleeve being a hollow tube; a lock cylinder base; an end of the lock cylinder base forming an accommodating space, a position limiting opening, and an accommodating opening; another end of the lock cylinder base forming a fixing rod; the lock cylinder base rotatably mounted in the lock sleeve; multiple discs; each of the discs having a key hole, a position limiting protrusion, and a disc notch; the key hole formed through the disc; the position limiting protrusion protruding from an outer annular surface of the disc; the disc notch concaved from the outer annular surface of the disc; multiple gaskets (40, 40A); each of the gaskets (40, 40A) having a ring body, a position limiting segment, a rotation limiting segment, and a concave segment; the ring body being a ring; the position limiting segment protruding outward from an outer annular surface of the ring body along a radial direction; the rotation limiting segment protruding from the position limiting segment along an axial direction of the lock sleeve; the concave segment concaved from the outer annular surface of the ring body; the discs and the gaskets (40, 40A) staggeredly accommodated in the accommodating space; a side surface of the position limiting protrusion abutting a side surface of the position limiting opening; two sides of the position limiting segment abutting two opposite side edges of the position limiting opening; each rotation limiting segment being adjacent to another side surface of the position limiting protrusion; a needle roller mounted in the accommodating opening, characterized in that each of the gaskets (40, 40A) has a gasket notch concaved inward; the rotation limiting segment is a bent sheet protruding from the gasket notch along the axial direction of the lock sleeve. a lock sleeve being a hollow tube; a lock cylinder base; an end of the lock cylinder base forming an accommodating space, a position limiting opening, and an accommodating opening; another end of the lock cylinder base forming a fixing rod; the lock cylinder base rotatably mounted in the lock sleeve; multiple discs; each of the discs having a key hole, a position limiting protrusion, and a disc notch; the key hole formed through the disc; the position limiting protrusion protruding from an outer annular surface of the disc; the disc notch concaved from the outer annular surface of the disc; multiple gaskets (40, 40A); each of the gaskets (40, 40A) having a ring body, a position limiting segment, a rotation limiting segment, and a concave segment; the ring body being a ring; the position limiting segment protruding outward from an outer annular surface of the ring body along a radial direction; the rotation limiting segment protruding from the position limiting segment along an axial direction of the lock sleeve; the concave segment concaved from the outer annular surface of the ring body; the discs and the gaskets (40, 40A) staggeredly accommodated in the accommodating space; a side surface of the position limiting protrusion abutting a side surface of the position limiting opening; two sides of the position limiting segment abutting two opposite side edges of the position limiting opening; each rotation limiting segment being adjacent to another side surface of the position limiting protrusion; a needle roller mounted in the accommodating opening, characterized in that each of the gaskets (40, 40A) has a gasket notch concaved inward; the rotation limiting segment is a bent sheet protruding from the gasket notch along the axial direction of the lock sleeve.