The invention relates to an accident oil collection device used for an offshore booster station, and aims at providing the accident oil collection device which is used for the offshore booster station, simple in structure and reliable in function. The device can contain the maximum amount of discharged oil when an accident happens, should have the oil-water separation function, and can prevent fire disasters from spreading. According to the technical scheme, the accident oil collection device is characterized by being composed of an accident oil tank and a water seal tank, the top of the side, close to the water seal tank, of the accident oil tank is communicated with the side wall of the water seal tank through a communicating pipe, a reversed-U-shaped water discharge pipe is arranged on the side wall, away from the water seal tank, of the accident oil tank, a breather pipe II is arranged on the top of the water discharge pipe, the top of the accident oil tank is provided with a manhole and a breather pipe I. A set of oil inlet pipes are arranged on the side, away from the communicating pipe, of the water seal tank. The accident oil collection device is suitable for the field of offshore wind power generation.