Ship liquid tank tightness test hole sealing tool and manufacturing method thereof

The invention discloses a ship liquid tank tightness test hole sealing tool and a manufacturing method thereof. The tool comprises a bottom plate, a cover plate, a sealing rubber ring, fixing bolts and fixing nuts, the rubber sealing ring is fixed to one side of the bottom plate, the multiple fixing bolts are installed on one side of the bottom plate, the circle centers of the fixing bolts are located on a circle concentric with the bottom plate, installation through holes corresponding to positions of the fixing bolts are formed in the cover plate, the diameter of the outer ring of the rubbersealing ring is equal to that of the bottom plate, the fixing nuts are matched with the fixing bolts, the bottom plate is installed on the inner side of a liquid tank, and the cover plate is installed on the outer side of the liquid tank. According to the ship liquid tank tightness test hole sealing tool, the air tightness of the sealed structure can be effectively ensured, so that the whole liquid tank tightness test wo