A easing pressure oxygen-dissolving device includes a container (10) in which at least one of wavy layers (20) for gas exchanging is arranged. Each of wavy layers (20) is provided with at least one oxygen storage exchange trough (E,F,G,I,J,K,L) for gas exchanging and a water inlet (A) for injecting water into the container (10) is arranged on the upper part of the container (10). On the lower part of the container (10), there are arranged a water outlet (B) for draining water out of the container (10) and a gas inlet (C) for injecting pure oxygen into the container (10). Oxygen enters the container (10) through the gas inlet (C) on the lower part of the container (10), and fills each oxygen storage exchange trough (E,F,G,I,J,K,L). When the entering oxygen arrives at a determinate pressure, water enters the container (10) from the water inlet (A) on the upper part of the container (10), and flows through, layer by layer, the air chambers of the oxygen storage exchange trough (E,F,G,I,J,K,L) filled with oxygen, so that, at this time oxygen can be naturally dissolved into water. As the pressure makes the quantity of dissolved oxygen increase largely, aqueous solution with high dissolved oxygen can be obtained when the water inlet (B) on the lower part of the container (10) is opened afterwards.
