Toxic liquefied gas leakage-proof storage tank and using method thereof

The invention belongs to the technical field of chemical engineering, and particularly relates to a poisonous liquefied gas leakage-proof storage tank and a using method thereof.The leakage-proof storage tank comprises a storage bin, a vacuum bin and a negative pressure bin which are arranged from inside to outside and is matched with an absorption system, and the system comprises a draught fan, an absorption tower, an absorption circulating pump and an absorption cooler. The design of the storage tank, the vacuum bin and the negative pressure bin is adopted, the vacuum bin is normalized airtight vacuum, and the problem that after the storage tank is damaged, material flowing and scattering are limited is solved; the negative pressure bin is normal pressure, a fan is started to cause negative pressure after leakage, the problem that the material flowing and scattering are limited after leakage of leakage points such as flange pipe fittings is solved, leaked materials are brought into an absorption system thro