A carbonated water manufacturing device, including a sleeve and a bottle cap which are mutually independent, wherein the sleeve includes a sleeve body and a plug body inside the sleeve the sleeve body and the plug body are provided with a first through-hole and a second through-hole at their side surfaces, respectively the bottle cap is provided with a perforated through-hole whose bottom is connected with an injection tube the upper part of the bottle cap is fittingly connected with the lower part of the plug part the opening at the lower part of the sleeve body is fittingly connected with the lower part of the outer edge of the bottle cap, and the top of the sleeve body acts on the carbon dioxide housing body in the sleeve body the connection of the lower part of the bottle cap and the injection tube is provided with a check valve.
