To provide a waste oil-collecting and regenerating system and a waste oil-regenerating apparatus having treating capacity and capable of stably regenerating a high-quality fuel oil.

The waste oil regenerating treating system 1 is equipped with a waste oil recovering step A for carrying out decision to pass or fail a waste oil based on a inspection standard and recovering the waste oil, an impurities- removing step B for removing the impurities by centrifugal separation from the recovered waste oil, a distillation step C for heating the waste oil from which impurities are removed, further removing the impurities mixed in the waste oil by evaporation and obtaining the regenerated fuel oil by distillation and a regenerated fuel oil-feeding step D for feeding the regenerated fuel oil.