Hemangiomas are the most common benign liver masses with a frequency of 0.4-7.3% at autopsy. They are usually discovered incidentally and a few require surgery. Spontaneous or traumatic ruptures are among indications of surgery for hemangiomas. We report a case of giant hepatic hemangioma presenting as hemoperitoneum following use of the slimming belt that underwent an emergent laparotomy. Abdominal exploration revealed that both right and left lobes of the liver were involved with giant hemangiomas. The liver was compressed by tightly packing laparotomy pads. After the operation, the patient was admitted to the surgical intensive care unit. Two days later, a second surgery was performed to remove the laparotomy pads. On the 6th day, the patient was discharged. One month later, to shrink the tumor, percutaneous transarterial embolization of the hepatic artery was performed.