Carbon dioxide gas preparation device required in analysis of isotopes of carbon and oxygen in carbonate

The invention discloses a carbon dioxide gas preparation device required in analysis of isotopes of carbon and oxygen in carbonate. The device includes a reaction container which allows a carbonate sample powder and phosphoric acid to be accommodated, a vacuum device used for vacuumizing the reaction container, and a sealing device used for sealing the vacuumized reaction container. The reaction container is in the shape of a vertical tube. A sealing connecting device is arranged on the top of the vertical-tube-shaped reaction container and is matched with the sealing device. A carbonate sample powder accommodating bin and a phosphorus accommodating bin, which are separated from each other, are arranged on the bottom of the vertical-tube-shaped reaction container. When the vertical-tube-shaped reaction container is inclined to a preset angle, phosphorus acid in the phosphorus accommodating bin is poured into the carbonate sample powder accommodating bin and is mixed with the carbonate sample powder in the carbonate sample powder accommodating bin.