The invention discloses a device for recycling undersea leaked petroleum generated after a maritime accident, and belongs to the field of marine oil recycling engineering. The device is provided witha barrel-shaped separation tank, wherein the upper portion and the lower portion of the separation tank are sealed, the interior of the separation tank is divided into at least three cavities from topto bottom through hydrophilic fiber blocks, the separation tank is provided with coaxial liquid inlet pipes, and the liquid inlet pipes in the cavities of the separation tank are provided with throwing mechanisms respectively, water outlets are formed in the positions where the liquid inlet pipes are connected with the throwing mechanisms, petroleum suction pipes are arranged in the cavities respectively, and the a water outlet pipe is connected with the bottom of the cavity which is located on the bottom of the separation tank. The throwing mechanisms each comprises an internal pipe and an external pipe which are coaxial, wherein rotating blades with the sections in an arc shape are arranged between the internal pipe and the external pipe, a strip-like notch is formed in the portion, between the two rotating blades, of the internal pipe, the notch corresponds to the corresponding water outlet, and the internal pipe is rotationally connected with the corresponding liquid inlet pipe through a bearing ring. The leaked petroleum is recycled by using a gravity settling method, the water content of the recycled petroleum is effectively reduced, water, the petroleum and gas are quicklyseparated, the petroleum recycling rate is high, and the processing efficiency is high.