Decolorization tower is used to remove the pigment of oil. Adding bleaching earth and active carbon in oil, then uniform mixing by mixer and temperature adjusting, finally the oil enters the bleaching tower for decolorization under vacuum state. This equipment have single layer structure and bilayer structure,. The equipment selection can according to the variety of oil and production scale. The characteristics of the tower are steam stirring, good sealing, low running cost and high efficiency.