Disclosed herein is a functional steel artificial reef installed in the sea to create aquatic resources. The artificial reef (100) includes an upper, lower part (120, 110) made by joining a plurality of first, second horizontal members (111. 113) to define a rectangular frame, a coupling part (130) coupling the upper and lower parts such that they are vertically spaced apart from each other, a plurality of first, second horizontal plates (115, 117) installed in or to both sides of the first, second horizontal members, a plurality of inclined plates (116) extending obliquely from upper surfaces of the first horizontal members in a height direction, and a plurality of vertical plates (118) extending vertically from the upper surfaces of the first horizontal members in a height direction.
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