The invention discloses a method for preparing aluminum oxide and white carbon black by utilizing oil shale ash. The method disclosed by the invention is characterized by comprising the following specific technical processes: predesilicification reaction, white black carbon preparation, raw slurry preparing, clinker sintering, dissolution filtration, desilicication cooling, carbonation decomposing, seeded precipitation roasting and the like. The method for preparing aluminum oxide and white carbon black by utilizing the oil shale ash is less in capital construction investment, low in operation cost, free of waste exhaustion and capable of being extensively applied to the chemical field.