The invention discloses a support method for normally installed hatch coaming of an ultra-large container ship. The support method for the normally installed hatch coaming of the ultra-large containership specifically comprises the following steps that scribing is performed on a platform to determine position lines of adjusting ground piers; first channel steel is welded on T-type total set ground piers; the adjusting ground piers and the T-type total set ground piers are placed; all the adjusting ground piers are adjusted to the same horizontal height, and the T-type total set ground piers are welded; broadside torsion box subsections are hoisted and placed on the adjusting ground piers; the broadside torsion box subsections and the first channel steel are welded and fixed; and the hatchcoaming is normally installed. According to the support method for the normally installed hatch coaming of the ultra-large container ship, the hatch coaming can be normally installed on the platform,the time of installing the hatch coaming in the docking stage can be reduced, the docking cycle is shortened, the number of turning over of hatch coaming subsections is reduced, and the reduction ofthe use time of a gantry crane is facilitated; and when the hatch coaming subsections are coated after the installation is completed, the damage to the deck paint by the bulk hatch coaming in the docking stage is avoided.