The present invention relates to: a method for preparing giant squid fish, comprising a step of dipping the body of a giant squid into an aqueous solution containing 0.01-2 wt% of sodium chloride; and giant squid fish prepared thereby. Ammonium chloride can be effectively removed when treating a giant squid according to the method of the present invention, and thus the characteristic bad odor and taste can be removed and the quality of the fish and a preference therefor can be increased, thereby enabling the application thereof as various food materials.
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