A pacemaker fixation device, comprising: a ring-shaped stent having opposing first and second ends; and at least one contractible member (31, 32) arranged at the first end of the ring-shaped stent, the contractible member (31, 32) comprising a connecting element (311, 321) and a plurality of contractible elements (312, 322), the plurality of contractible elements (312, 322) disposed along a circumferential direction of the ring-shaped stent, all the contractible elements (312, 322) having first ends converging at and connected to the connecting element (311, 321), the connecting element (311, 321) configured for detachable connection with an external mechanism, all the contractible elements (312, 322) having second ends connected to the first end of the ring-shaped stent, the first ends of the contractible elements (312, 322) arranged external to the first end of the ring-shaped stent in an axial direction of the ring-shaped stent, the contractible member (31, 32) configured to cooperate with the external mechanism to be contracted and folded when retracted by the external mechanism, which in turn contracts and folds the ring-shaped stent, characterized in that: the ring-shaped stent comprises a body and at least one fixation member (21, 22), each fixation member (21, 22) disposed at a respective one of a first end and/or an opposing second end of the body, the fixation member (21, 22) comprising a plurality of support struts (211, 221) arranged along the circumferential direction of the ring-shaped stent, all the support struts (211, 221) having first ends connected to the body and second ends connected to the contractible member (31, 32), the fixation member (21, 22) arranged external to the body. a ring-shaped stent having opposing first and second ends; and at least one contractible member (31, 32) arranged at the first end of the ring-shaped stent, the contractible member (31, 32) comprising a connecting element (311, 321) and a plurality of contractible elements (312, 322), the plurality of contractible elements (312, 322) disposed along a circumferential direction of the ring-shaped stent, all the contractible elements (312, 322) having first ends converging at and connected to the connecting element (311, 321), the connecting element (311, 321) configured for detachable connection with an external mechanism, all the contractible elements (312, 322) having second ends connected to the first end of the ring-shaped stent, the first ends of the contractible elements (312, 322) arranged external to the first end of the ring-shaped stent in an axial direction of the ring-shaped stent, the contractible member (31, 32) configured to cooperate with the external mechanism to be contracted and folded when retracted by the external mechanism, which in turn contracts and folds the ring-shaped stent, characterized in that: the ring-shaped stent comprises a body and at least one fixation member (21, 22), each fixation member (21, 22) disposed at a respective one of a first end and/or an opposing second end of the body, the fixation member (21, 22) comprising a plurality of support struts (211, 221) arranged along the circumferential direction of the ring-shaped stent, all the support struts (211, 221) having first ends connected to the body and second ends connected to the contractible member (31, 32), the fixation member (21, 22) arranged external to the body.