The invention provides a deep-water underwater oil leakage collection-storage device. The deep-water underwater oil leakage collection-storage device is composed of an underwater oil leakage collection cover, an underwater automatic bag supply rack, a sewage pump, soft oil storage bags, fixed self-sealing joints, movable self-sealing joints, a self-sealing joint docking clamping seat, a docking-and-releasing actuator, a capacity detection circuit, and a release control circuit. The underwater oil leakage collection cover is provided with an oil-water interface instrument and a deflation sealing liquid valve, and a driving mechanism self-sealing joint is arranged at one end of the underwater automatic bag supply rack; the docking clamping seat is provided with a locking-and-releasing movable assembly, the capacity detection circuit comprises an independent power supply which does not rely on external connection, and the release control circuit comprises a proximity switch; a suction port of the sewage pump communicates with a drain outlet of the underwater oil leakage collection cover through a pipeline, the bottom ends of the fixed self-sealing joints are rigidly connected with anoutlet of the sewage pump, and the top ends of the fixed self-sealing joints are clamped in the self-sealing joint docking clamping seat, one side of the self-sealing joint docking clamping seat is connected with the underwater automatic bag supply rack, clamping grooves of the self-sealing joint docking clamping seat and the underwater automatic bag supply rack are smoothly aligned to each other,the locking-and-releasing movable assembly of the self-sealing joint docking clamping seat is mechanically connected with the docking-and-releasing actuator, the soft oil storage bags are bonded to the complete capacity detection circuits and connected with the movable self-sealing joints, and the soft oil storage bags are clamped into the clamping grooves of the underwater automatic bag supply rack through movable self-sealing joints connected to the soft oil storage bags. The invention further disclosed an application method of the deep-water underwater oil leakage collection-storage device.