Disclosed herein is a fish robot. The fish robot characterized in comprising a head unit corresponding to head portion of a fish; a driving unit coupled to the head unit to generate driving force by sinusoidal swimming movement; a waterproof cover coupled to the head unit with elasticity in which the driving unit being inserted to be sealed; and a body unit coupled to the head unit with elasticity corresponding to body portion of the fish in which the waterproof cover being inserted to be supported.