The present invention relates to a bellows-type ballast tank module for VLCC that can increase cargo loading by installing a bellows-type ballast module inside the cargo tank and is environmentally friendly, and is installed so as to be expandable and contractible in the cargo tank, and crude oil is discharged Install a bellows-type ballast tank module that injects fresh water for ballasting, but the ballast tank module includes an upper frame installed on the upper part of the cargo tank, and a bellows water tank installed on the lower part of the upper frame to accommodate fresh water; , a support installed outside the upper frame and the bottom plate, a lower frame installed under the bellows water tank, and an extension means installed between the upper frame and the bottom plate to expand and contract the bellows water tank includes
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