The utility model discloses a marine three -dimensional storehouse carbon dioxide refrigerating system, its structure is including the evaporimeter that connects gradually into circulation circuit, acompressor, condensers, the reservoir, electronic expansion valve, the upper portion space in the freezer is installed to the evaporimeter, the condenser is installed in the bottom of ship, realize the refrigeration that lasts to the freezer through the incessant flow of carbon dioxide refrigerant in circulation circuit, because the upper portion space in the freezer is installed to the evaporimeter, make air conditioning can uniform application to the whole space of freezer, and the condenser is installed in the bottom of ship, because the mobility of sea water makes its temperature comparatively steady, make the condenser can be directly and the sea water carry out steady heat exchange, mechanical energy loss when not only having saved the condensation heat transfer, and steady heat exchange can effectively reduce the fluctuation of freezer storehouse temperature, the preservation phase of food materials such as aquatic products is preserved in effective extension.