PROBLEM TO BE SOLVED: To provide an insulating oil improving device, an insulating oil improving column, and an insulating oil improving method for easily removing impurity and additives such as moisture or deteriorated materials of insulating oil at a low cost.SOLUTION: An insulating oil improving device for removing impurity and additives of insulating oil 1, includes: a column 2 including filling materials 21 composed of at least one of metal calcium (Ca), and calcium oxide or calcium hydroxide; a heating means 3 for heating inside the column 2; a supply section 4 for supplying insulating oil 1 to the column 2; and a recovery section 5 for recovering the insulating oil 1 which has passed the column 2.
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