The invention discloses an offshore high-pressure escape system, which comprises a life and escape dual-purpose cabin, a main control room unit and an emergency control room unit, and is characterized in that the dual-purpose cabin comprises a base, a cabin body, a counterweight, a main control butt joint plate, an emergency control butt joint plate, an emergency power supply and a plurality of emergency gas cylinders; the main control room unit and the emergency control room unit are arranged on a working mother ship, the main control room unit is connected with the main control butt-joint plate through a pipeline, and the emergency control room unit is connected with the emergency control butt-joint plate through an umbilical cord. According to the escape system, the life and escape dual-purpose cabin is adopted, the escape time is saved, the personal safety of divers in the cabin can be better guaranteed, the position of the water line on the outer side of the cabin body is reasonably adjusted through the counter weight, the stability of the cabin body floating on the sea surface in an emergency is improved, and the emergency gas cylinders and the emergency power supply supply gas and power to the dual-purpose cabin in emergency, so that the consumption demand of the diver is ensured, and the escaping diver has enough time to wait for rescue.