Abstract: Argon is widely used in the field of industrial production. The content of argon in atmosphere is less, which is generally obtained by cryogenic separation. Normally, liquid argon products are stored in cryogenic tanks and being pressurized and vaporized for use. However, due to heat transfer between cryogenic tanks and environment, parts of argon are evaporating cause to a certain loss. For purpose of recovering the evaporated argon, the argon recoverer is researched. It liquefies the evaporated argon through liquid nitrogen cold source, after which the liquefied argon is back to the tank. According to the operation of the existing plants, this device has been applied successfully. It maximizes the utilization rate of argon.