The present invention relates to a seawater simulation system for a test capable of practically simulating various conditions to perform tests for building and operating a ship and an offshore plant. The seawater simulation system for a test comprises: a seawater simulation tank including an accommodation space in which seawater is accommodated; a circulation pump circulating seawater along a seawater route passing through the seawater simulation tank; and a water quality control device provided on the seawater route to control the quality of circulated seawater.
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