Carbon dioxide absorbing tank

The invention relates to a carbon dioxide absorbing tank. The carbon dioxide absorbing tank comprises a shell, an air inlet and an air outlet, wherein the air inlet and the air outlet are positioned in the shell; a diaphragm cabin is arranged in the shell; the space of the cavity of the shell is divided into an independent vertical cavity via the diaphragm cabin; the vertical cavity is filled witha carbon dioxide absorbent; at least one group of circulating holes are formed in the bottom of the diaphragm cabin; the shell comprises a barrel with openings in the upper end and the lower end; anupper cover is assembled on the opening of the upper end of the barrel in a sealed manner; a lower cover is assembled on the opening of the lower end of the barrel in a sealed manner; an air inlet isformed in the center of the upper cover; the air inlet correspondingly communicates with the diaphragm cabin; and exhaled air enters from the upper end of the diaphragm cabin, and enters the verticalcavity through the circulati