Abstract: A dispensing device utilizing a gas pocket assembly. The gas pocket assembly includes an inflatable gas pocket and a cylindrical mounting seat. The dispensing device has a gas introduction mechanism for introducing high-pressure gas to the gas pocket assembly, a pressurized cylinder for containing liquid, and a dispensing head mechanism for dispensing the liquid. the gas pocket assembly is secured to a bottom wall of the pressurized cylinder. The dispensing of the liquid, which creates a gradual dropping of pressure, causes the inflatable gas pocket to swell or inflate gradually until the interior of the pressurized cylinder is entirely occupied by the gas pocket.