The invention aims at providing a novel optimized floating oil separator which is used for separating and filtering a small amount of floating oil contained in a VOCs gas mixture .The floating oil separator is a floating oil separator with two-level stuffing box baffles, and after the VOCs gas mixture enters the floating oil separator, the floating oil in the gas mixture is effectively captured by the inclined stuffing box baffles in the first place; then, the gas mixture continues to pass through absorbent to go in a bypassing mode, and the floating oil in the gas mixture is further absorbed through the absorbent; then the gas mixture passes through another horizontal stuffing box baffle, and the floating oil or other non-gaseous substances in the gas mixture continue to be deeply captured .After the liquid level of the absorbent rises to a certain height, the floating oil on the liquid surface of the absorbent flows into a floating oil pool, and then according to the liquid level condition of the floating oil in the floating oil separator, the floating oil is directly discharged during selected time .The separator is convenient to operate, the effect of separating the floating oil in the VOCs gas mixture is good, and clean gaseous fluid can be provided for further treatment.