The invention provides an oil containment method and particularly provides a method for utilizing an air curtain to achieve oil containment so as to achieve the problem that an existing oil containment boom is not ideal in oil containment effect due to efficiency reduction. The oil containment method comprises the following steps that the air curtain arranged underwater generates a part of continuous air bubbles continuously releasing air into water; the air bubbles drive surrounding liquid to flow in the rising process to form air bubble plumes so as to play a blocking role; original vertical flowing direction is changed into horizontal flowing direction to form surface flows so as to achieve oil containment effect when the air bubble plumes reach the free liquid face. A device for implementing the method comprises the oil containment boom, an air curtain generating portion and an air injection portion, wherein the air curtain generating portion is arranged underwater and communicated with the air injection portion, and the oil containment boom surrounds the inner side and the outer side of the air curtain generating portion. The method and the device achieve oil containment effect by utilizing rising buoyancy of the air bubbles and planar potential flows produced by the air bubbles breaking on the free liquid face, and overcome the shortcomings of a traditional oil containment boom in the using process.