The working principle of carbon dioxide removal machine is molecular sieve adsorption closed-circuit cycle. That is, the gas in the reservoir is extracted through the pipeline, and the carbon dioxide gas is adsorbed to the activated carbon through the adsorption tank of the equipment, and then the remaining air is returned to the reservoir. The device has two molecular tanks, and when one regenerates, the other works, and the cycle goes back and forth. The equipment is equipped with the company's four-way valve, diameter 100. Its gas flow is incomparable to any similar products at home and abroad. The equipment is equipped with automatic replenishment valve, when the O2 value in the reservoir is lower than the set value, the automatic opening of supplemental oxygen to the set value.