Disclosed is a seawater erosion fatigue test system which a plurality of specimens is vertically arranged in a series and in multiple stages, thereby simultaneously testing the specimens. The disclosed seawater erosion fatigue test system comprises: a jig combined to both ends of a specimen and connecting the specimens to vertically arrange the specimens in a series and in multiple stages; a sea water erosion tank containing sea water, and having the specimens arranged by penetrating the inside so as to be exposed to the contained sea water; an actuator applying fatigue loads to the specimens at the same time; and an insulating fastening pin fastening the jig and the specimens, and blocking the conduction current between the jig and the specimens.
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