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The present invention relates to an inner tub support structure for an LNG storage tank for a ship, and more particularly, to an inner tub support structure for an LNG storage tank for a ship, in which extension/contraction in a circumferential direction and lengthwise direction of the inner tub is

The present invention relates to an inner tub support structure for an LNG storage tank for a ship, and more particularly, to an inner tub support structure for an LNG storage tank for a ship, in which extension/contraction in a circumferential direction and lengthwise direction of the inner tub is not limited during an extension/contraction of the inner tub resulting from a temperature variation caused by a storage and discharge of LNG. To this end, an inner tub support structure for an LNG storage tank for supporting an inner tub of the LNG storage tank having a cylindrical outer tub and a cylindrical inner tub, comprises a sliding main supporter which is arranged in one side of a bottom of the outer tub so as to fix the center of a bottom surface of the inner tub, and which has an elongated sliding groove formed in the lengthwise direction of the inner tub; a fixing main supporter which is arranged in the other side of the bottom of the outer tub so as to fix the center of the bottom surface of the inner tub, and which has a circular groove; and a sub supporter which is arranged in the bottom of the outer tub so as to support the bottom surface of the inner tub, wherein the bottom surface of the inner tub is not fixed at the sub supporter.

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