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PURPOSE : A method for reproducing an absorption oil using crystallization is provided to collect an expensive profitable element of high price when reproducing the absorption oil using the crystallization. CONSTITUTION : The method for reproducing an absorption oil using crystallization is characterized in that, when distilling an absorption oil in a distillation top 1 using a steam distillation, BTX element, degradation substance and profitable absorption oil element are extracted to the upper part of the top by controlling a top temperature; the profitable absorption oil element is collected in the lower part of the top, the BTX element is collected in the upper part of the top and the degradation element is collected in the middle part of the top by a distillation top 2 using a re-boiler; among the remaining elements from the lower part of the distillation top 1, matters to be easily crystallized or solidified at a low temperature are separated in a crystallization device; and an expensive profitable element is collected by being separated from a crystallization separator and the remaining polymer matters are destroyed.