Background: Patients with acute myocardial infarction (AMI) complicated with arrhythmia are not uncommon. Insertion of temporary pacemakers (tPMs) in patients with arrythmia during acute myocardial infarction (AMI) is imperative support therapy. Arrhythmias include high-degree atrioventricular block (AVB), sinus arrest/bradycardia, and ventricular arrythmia storm. To date, no study has evaluated the prognosis of tPMs in patients with AMI complicated with arrhythmia. Especially in the era of thrombolysis or emergency percutaneous coronary intervention (PCI) for coronary artery revascularization, our study was designed to investigate the value of tPMs implantation in cases of AMI complicated with various arrhythmias. Methods: From January 2009 to January 2019, 35,394 patients with AMI, including 62.0% (21,935) with ST-segment elevation myocardial infarction (STEMI) and 38.0% (13,459) with non-ST-segment elevation myocardial infarction (NSTEMI) in four hospitals, were reviewed. A total of 552 patients with AMI associated with arrythmia were included in the cohort. Among the 552 patients, there were 139 patients with tPM insertions. The incidence trend of myocardial infarction complicated with various arrhythmias in the past 10 years was analysed, and the clinical characteristics, in-hospital mortality, postdischarge mortality, composite endpoints of modality, and independent risk factors were compared in patients with and without tPM in the era of coronary artery revascularization. Results: In patients with AMI-associated arrythmia, high-degree AVB was the major cause of tPM insertion (p = 0.045). In the past 10 years, the number of patients with high-degree AVB, tPM implantation, ventricular arrythmia storm, and in-hospital mortality has decreased year by year in the era of coronary artery revascularization. In the tPM group, the culprit vessel was the left main artery, and cardiogenic shock, acute renal injury and high brain natriuretic peptide (BNP) levels were independent risk factors for patients with AMI complicated with arrhythmia. The in-hospital mortality in the tPM group was higher than that in the non-tPM group. The patients with tPM insertion showed better postdischarge survival than patients without tPM insertion. Conclusions: In the era of emergency thrombolysis or PCI, coronary revascularization can ameliorate the prognosis of patients with AMI complicated with various arrhythmias. Temporary pacemaker insertion in patients with AMI complicated with arrhythmia can reduce the postdischarge mortality of these patients.