Background Acute cholangitis (AC) is an acute inflammation of the biliary tract caused by bacterial infection, which occurs due to biliary obstruction primarily because of bile duct stones. We aimed to study the effect of laparoscopic common bile duct exploration in the treatment of complicated AC for elderly patients. Method Elderly patients with complicated AC admitted to our hospital from August 2014 to August 2018 were considered. According to the patients' general conditions and the American Society of Anesthesiologists' (ASA) grade, 98 patients were divided into three groups: ASA grade II, 38 patients; ASA grade III, 33 patients; and ASA grade IV, 27 patients; all patients underwent emergency laparoscopic common bile duct exploration within 8 h of admission. The perioperative data of these patients were analyzed. Results There were no significant differences between the three groups in preoperative laboratory test results, except for albumin levels. Conversely, when compared in every group, there were some significant differences in changes between pre-and postoperative laboratory test results, except for albumin levels. There were no significant differences between the groups in terms of perioperative data (operation time, blood loss, peritoneal drainage time, postoperative time to flatus, and postoperative hospital stay). Although four patients had postoperative complications, there were no significant differences in the rate of complications between the groups. Conclusion Laparoscopic common bile duct exploration is a safe, effective, and feasible method for treating complicated AC in elderly patients. It should be actively used in clinical work to rapidly relieve biliary obstruction.