PURPOSE: A T-shaped coastal erosion prevention block is provided to prevent a lower erosion prevention block from moving or crumbling and coastal erosion caused by waves because an upper erosion prevention block is joined to the lower erosion prevention block to be separated so that the speed of seawater or waves is dampened. CONSTITUTION: A T-shaped coastal erosion prevention block(10) comprises a lower erosion prevention block(20) and upper erosion prevention block(30). The lower erosion prevention block comprises a cutoff wall(21) and support wing(22). The cutoff wall comprises a joining groove in the upper part and conveyance hole(212) in the side part. The supporting wing is formed to correspond to the lower part of the cutoff wall. The upper erosion prevention block comprises a neck portion(31) and head(32). The neck portion is inserted into the joining groove to be separated and fixed by a bolt. The neck portion comprises a plurality of through holes(33) in order that seawater can pass through. The head is formed in the upper part of the neck portion to be integrated.
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