This report describes a case of choroidal effusion after intravitreal brolucizumab injection for wet age-related macular degeneration (AMD). A 71-year-old Korean man with a history of wet AMD visited our clinic. On examination, the best-corrected distance visual acuity (BCVA) was 20/200 in the right eye. Fundus photography and optical coherence tomography showed wet AMD in the right eye. The patient showed no improvement while undergoing treatment with anti-vascular endothelial growth factor therapy (aflibercept, 6 times; ranibizumab, 5 times; and bevacizumab 3 times). We administered intravitreal brolucizumab injections in the right eye of the patient. After first brolucizumab injection, the BCVA improved from 20/200 to 20/63 in the right eye. Two months after the intravitreal brolucizumab injection, recurrence of wet AMD and deterioration of the BCVA to 20/200 was observed on the right eye. The patient underwent a second intravitreal brolucizumab injection in the right eye in the same manner. Three days after the second brolucizumab injection, choroidal effusion was observed in the right eye. The choroidal effusion resolved completely 12 days after the injection, without any additional treatment. Intravitreal brolucizumab injection may provoke choroidal effusion. Although it may resolve promptly, short-term follow-up fundus examinations may be necessary for the early diagnosis and treatment of this complication.