Charging and starting device for molecular sieve system of air separation unit

The utility model relates to a charging and starting device for a molecular sieve system of an air separation unit, which comprises a molecular sieve, a molecular sieve air inlet valve, a molecular sieve charging valve, a molecular sieve outlet valve and an air inlet air separation device valve, and is technically characterized in that: a charging pipeline is additionally arranged between the molecular sieve outlet valve and the air inlet air separation device valve, and a control valve is arranged on the charging pipeline. In the charging and starting device, after the balance between the pressure of a boost outlet of the air separation unit and the pressure in the molecular sieve is kept, the molecular sieve can be quickly put into use, a lot of startup energy consumption of the air separation unit is saved, and air oxygen, nitrogen and argon products can be conveyed in advance.