Zeolite molecular sieve is a hydrate of crystalline aluminosilicate metal salt, and its chemical general formula is MX/m [(AlO2) x (SiO2) y] ZH2O. M stands for cation, M stands for valence, Z stands for hydration number, and X and Y are integers. After zeolite molecular sieve is activated, water molecules are removed, and the remaining atoms form a cage structure with a pore size of 3~ 10? . There are many holes with a certain size in molecular sieve crystals, and many holes with the same diameter are interconnected. Because molecular sieve can adsorb molecules smaller than its pore size into the cavity and exclude molecules larger than its pore size from the cavity, it plays a role in screening molecules. Unable to separate, the molecular size of oxygen is 0.296nm, the molecular size of nitrogen is 0.304nm, and the pore size of zeolite molecular sieve is greater than 0.4nm, so both oxygen and nitrogen molecules can pass through the molecular sieve, and the separation effect cannot be achieved.