Abstract: A soda machine with a pressure adjustment fitting, which includes a carbon dioxide steel cylinder, a soda cylinder, a gas outlet controller fitted to the carbon dioxide steel cylinder and a gas inlet fitted to the soda cylinder; said gas outlet controller including a gas inlet body, a drive rod, a valve core and a valve core seat, the gas inlet body including a drive rod channel, a valve core seat chamber and a gas outlet; a pressure adjustment valve including a valve housing, a drive rod, a limit nut, a gas block, an adjustment screw rod, an adjustment-fixing sleeve, a spring and a rotating knob.