A prefabricated block debris barrier is provided to construct a debris barrier within a short period without the concrete curing process. A prefabricated block debris barrier has a prefabricated block which is combined in longitudinal and width direction to form a unit horizontal layer(B), a soil and stone barrier portion(A) is built by a unit horizontal layer combined above another unit horizontal layer, a two connecting grooves are formed in the upper side of the block body(10) of the prefabricated block, a combining pin(20) is fixed and combined to the top in the central part in which the linking groove is crossed. A fitting groove is formed in the lower-part of the block body of the prefabricated block faced with the combining pin, a connecting plate(30) is settled in the connecting groove, a plurality of coupling holes are formed in the combining plate to combine the combining groove to the combining pin.
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