A disc tumbler cylinder lock has a lock cylinder base, multiple discs, and multiple gaskets. The lock cylinder base has an accommodating space, a position limiting opening, and an accommodating opening. Each of the discs has a position limiting protrusion and a disc notch. Each of the gaskets has a ring body, a position limiting segment, and a rotation limiting segment. The position limiting segment protrudes outward from an outer annular surface of the ring body along a radial direction. The rotation limiting segment protrudes from the position limiting segment along an axial direction of the lock sleeve. The discs and the gaskets are staggeredly accommodated in the accommodating space. A side surface of the position limiting protrusion abuts a side surface of the position limiting opening. Two sides of the position limiting segment abut two opposite sides of the position limiting opening.