The present invention is inserted in the inner center of the tetrapod, the central structure of the hollow structure in which the structure protrusions are formed in the same number and direction as the protruding branches of the tetrapod on the outer surface, at least one first connecting hole formed on the end surface of the protruding structure, and the center Consisting of a plurality of connecting members formed on the surface of the structure to connect the inside and outside of the central structure and a rod or pipe-shaped member whose one end is connected to the first connecting hole, the central structure and the connecting member Is to form a reinforcing structure inserted into the interior of the tetrapod, and to a tetrapod reinforcement structure in which concrete is injected into the central structure through a pouring hole when concrete is placed for production of the tetrapod.
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