The diagnosis of intestinal diverticulosis is difficult to achieve preoperatively because the clinical symptoms are usually non-specific. Intestinal bleeding is a rare complication of jejunal diverticulosis. Its diagnosis and treatment can be difficult and an emergency laparotomy is often needed. We report a case of massive intestinal bleeding from jejunal diverticulosis. The correct diagnosis was first suggested by CT and then confirmed at laparotomy. The treatment was a segmental jejunal resection with primary anastomosis.