The present invention relates to a method for preparing precipitated calcium carbonate of nano-powder from a shellfish shell and an apparatus therefor. The method for preparing the precipitated calcium carbonate of nano-powder includes the steps of preparing quicklime (CaO) by subjecting the shell to heat treatment at a temperature of 800 to 900°C; Preparing a suspension of slaked lime (Ca(OH) 2 ) having a pH of 12 to 13 by reacting the quicklime with water; And reacting the slaked lime suspension with carbon dioxide at a reaction temperature of 30 to 80°C.
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