The aim of this study was to examine the effect of a nurse‐led telephone‐based peer support program on health outcomes in patients after cardiac pacemaker implantation. Seventy six patients who received cardiac pacemaker implantation were recruited as participants and randomly assigned to either the peer support group or the usual care group. The usual care group received routine care and health education measures provided by nurses; the peer support group received telephone‐based peer support. Health‐related quality of life, self‐care knowledge–attitudes–practice, postoperative anxiety and depression, compliance with attending scheduled follow‐up visits, and the incidence of postoperative complications were evaluated at baseline and 6 months’ postintervention for the two groups. The result showed that the interventions had a better effect on self‐care knowledge–attitudes–practice, postoperative anxiety and depression, and compliance with attending scheduled follow‐up visits in the peer support group than in the usual care group. This study confirms that telephone‐based peer support improves self‐care ability, compliance with attending scheduled follow‐up visits, and reduces postoperative anxiety and depression more effectively than conventional nurse care among patients with cardiac pacemaker implantation.