In order to improve the corrosion resistance of the coating and enhance the degreasing ability of the pretreatment degreasing process on the surface of body metal parts,the degreasing system oil removal strategy based on a new oil-water separator was proposed.Firstly,the floating overflow oil suction port was changed;Secondly,the liquid level floating oil separation device was added in the oil-water separator system;Finally,the effectiveness of the method was proved by the contrast experiment before and after the transformation,which could reduce the loss of degreasing original liquid。