Background Pneumoperitoneum to maintain a constant gas flow to assist various surgeries is known to cause severe bradycardia and has been linked to heart failure;; however, a recent study demonstrated that it is not linked to poorer surgical outcomes; accordingly, it does not require routine preventive measures. Thus, whether there is a link between sudden bradycardia development and surgical procedures is controversial. We report the case of severe bradycardia that occurred along with a complete atrioventricular block (CAVB) during peritoneum creation in robot-assisted radical prostatectomy (RARP). Case presentation A 72-year-old man presented at our hospital with prostate cancer and underwent RARP. After pneumoperitoneum, severe bradycardia and CAVB were observed; thus, the surgery was extended by inserting a temporary pacemaker (TPM). Conclusion Because of the difficulty in performing emergency procedures in robot-assisted surgeries, the current case is reported to provide an awareness that surgeons should be cautious of the possible complication of bradycardia and CAVB during such operations, and thus should take steps necessary for managing induction of such conditions.