High-sealing leakage-proof storage tank for chemical gas

The invention discloses a high-sealing leakage-proof storage tank for chemical gas. The storage tank comprises an outer tank body, an inner storage tank, a collecting pipe, a supporting ring and a collecting assembly. The collecting pipe covers a welding seam at the welding position of the inner storage tank sheet; the collecting pipe comprises an annular pipe and a vertical pipe which are communicated with each other, the annular pipe is connected with a suction pipe, the suction pipe is communicated with an air extractor, and a vacuum cavity is formed by vacuumizing. Every two supporting rings are oppositely arranged to divide the clamping cavity into a functional bin and a negative pressure bin. The invention relates to the technical field of chemical industry, in particular to a high-sealing leakage-proof storage tank for chemical gas, double protection is formed for a welding seam of an inner storage tank through a collecting pipe and a negative pressure bin, in addition, the interior of the collecting p