Air separation device and method for preparing large amount of liquid

The air separation device comprises a shell, a steering mechanism is arranged at the left end of the top of the shell, an air suction cover is arranged on the inner surface of the steering mechanism, a suction fan is fixedly installed at the upper end of the left side of the shell, and the input end of the suction fan communicates with the bottom of the air suction cover through a pipeline. The steering mechanism, the air suction cover, the suction fan, the activated carbon filter screen, the semiconductor chilling plate, the first partition plate, the second partition plate, the molecular sieve adsorber and the heat exchanger are arranged, pre-cooled air is purified by the molecular sieve adsorber, then conveyed into the heat exchanger and finally conveyed into the low-temperature rectifying tower, and therefore the low-temperature rectifying tower can be purified according to different boiling points of all components. Argon, oxygen and nitrogen are conveyed into the argon collecting tank, the oxygen collec