The present invention relates to a method for regenerating spent acid clay. According to the present invention, it is possible to recover more than 98% of the residual oil from the spent acid clay, and the recovered oil is capable of producing refined oil through dewaxing and deodorization processes. In addition, the waste acid clay from which the oil is separated in the supercritical extraction process has the same quality as the new product in terms of bulk density, moisture content, particle size and filtration time, so the waste acid clay can be reused, resulting in waste from reuse The throughput can be significantly reduced. Acid clay is widely used for oil well refining and filtration, removal of dioxide and peroxide, decolorization and filtration of vegetable oil, soap-gum removal for blue light, and cationic adsorption and absorption desiccant for pollution prevention, so reuse of spent acid clay As a result, environmental pollution can be reduced, and economic effects are expected.
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