Bladder hemangioma is a rare benign tumor. While partial cystectomy remains an effective treatment option for large bladder hemangioma, the combined method of neodymium : yttrium aluminium garnet and holmium : yttrium aluminium garnet laser irradiation is an effective and less invasive treatment option. We report a case of large bladder hemangioma in an otherwise healthy 4-year-old boy, successfully treated with serial endoscopic yttrium aluminium garnet laser irradiation. There was no recurrence, and normal bladder function was preserved. Serial yttrium aluminium garnet laser irradiation is thus a useful, less invasive method for cases of large tumors.