A pressurized gas-water mixer, utilized in a multifunctional oxygenated water machine, is disclosed. The pressurized gas-water mixer has a hollow main body which has an inlet for entering the water and the ozone gas and an outlet for flowing out a product. The water and the gas flow into the hollow main body in the same direction so that a pressure difference is obtained to well mix them at a narrow portion, and then the ozone gas is attracted into the hollow main body when the water flows out so as to produce an attraction. Consequently, the water and the ozone gas can flow quickly and smooth and mix with each other quickly.