To provide an oil separation device and method for oil-containing substance, capable of safely and efficiently recovering oil from an oil-containing substance while improving productivity.

Supersonic superheated steam is sprayed from a superheated steam nozzle 41 to the oil-containing substance supplied from the outside through a supply port 42. The superheated steam is forcedly collided to the oil-containing substance being supplied at a supersonic flow velocity in this way, whereby the oil in the oil-containing substance is vaporized while cracking and agitating the oil-containing substance supplied to a treatment tank 10.