The present invention relates to a heat insulating means of the cargo tank dome portion of the liquid cargo carrier, and more particularly to a heat insulating means of the cargo tank dome that does not require repair due to heat shrinkage and thermal expansion.;The insulation means of the cargo tank dome according to the present invention is achieved by a connecting member for attaching the metallic plate to the bottom of the cargo tank dome and a two-layer metallic plate attached to the connecting member.;As described above, the low temperature liquid cargo storage cargo tank of the present invention provides an insulation effect by the heat insulation means installed on the bottom of the cargo tank dome, so there is no fear of damage due to deformation due to thermal expansion or heat shrinkage, thereby reducing the burden of additional repair work. . In addition, construction is easy because the plate is attached to the upper plate of the cargo tank dome as a connecting member than the conventional method of attaching and sealing the heat insulating material.
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