A 55-year-old male underwent complete resection of a T12 intraspinal tumor and subsequently developed dizziness and loss of consciousness on postoperative day 2. A subdural hematoma (SDH) of the left frontotemporoparietal space with uncal herniation was seen on computed tomography. This unusual case of acute intracranial SDH after spinal surgery is discussed, and literature review is performed. We aim to discuss the possible mechanism by which this complication occurred.