To automatically collect oil flowing to the sea with high efficiency.

A shut sea area 20 is formed around flowing and drifting oil (b), at the same time, an oil fence 3 is stretched by an oil fence stretching ship so as to open a suction inlet 5b of a collection pipe 5 in an oil collection ship 2 to the shut sea area 20, an air curtain 4 is formed of a jetting bubble group of compressed air supplied from a compressor 10 inside the oil fence 3, a secondary current (a) directed to the suction inlet 5b by the air curtain 4 is generated in the shut sea area 20, the flowing and drifting oil (b) is made to flow into the suction inlet 5b together with sea water with the said secondary current (a), and upper layer concentrated contaminated water (c) automatically separated by the collection pipe 5 is stored in a collection tank 13 with a collection pump 12. By the constitution, oil collection can be automatically made with high efficiency.