The invention discloses a portable sea self-rescue survival terminal. The portable sea self-rescue survival terminal comprises a belt and a life buoy located in the belt, wherein a connecting supporting mechanism, an air inflation mechanism, a sucking mechanism and an evaporation water taking mechanism are arranged in the belt; the connecting supporting mechanism comprises two magnets, four connecting plates, four sliding blocks, four sliding springs, four ejection springs, four limiting blocks, four sliding rods, four connecting springs, four ropes, a sliding column and a telescopic spring, and two ejection cavities with downward openings are formed in the belt; when the portable sea self-rescue survival terminal is used and a drowning person floats, the drowning person can lean on the life buoy conveniently through the connecting supporting mechanism, and the physical power of the drowning person is saved; when the portable sea self-rescue survival terminal is not used, the connecting supporting mechanism is hidden in the portable sea self-rescue survival terminal, wearing is not influenced during use, and the wearing time is reduced, so that the self-rescue time is more sufficient; and the portable sea self-rescue survival terminal can automatically desalinize seawater, fresh water is provided, and survival time of the drowning person on the sea is conducive to being prolonged.