Abstract: Disclosed is a retaining wall construction system for preventing tsunamis and flood damages and a construction method thereof. The retaining wall construction system includes hexagonal multi-layered interlocking blocks built in a plurality of lines for forming a retaining wall, wherein S-shaped connection sections are formed on an outer periphery for a plurality of interlocking blocks, and hexagonal multi-layered interlocking blocks, which are adjacent to each other and different from each other, are connected to each other via the S-shaped connection sections to be movable in the vertical direction.

Abstract: The present invention pertains to a retaining wall construction system for preventing tsunamis and flood damages and a construction method thereof. The retaining wall construction system for preventing tsunamis and flood damages includes hexagonal multi-layered interlocking blocks (10) built in a plurality of lines for forming a retaining wall, wherein S-shaped connection sections (11) are formed on an outer periphery for a plurality of interlocking blocks, and hexagonal multi-layered interlocking blocks (10), which are adjacent to each other and different from each other, are connected to each other via the S-shaped connection sections (11) to be movable in the vertical direction. According to the present invention above, it is possible to semi-permanently maintain a stable state at the basic lower portions of the structure as the vertically interlocked blocks lower like a shutter to block caved-in spaces when the basic portions of the structure are caved in by waves or flowing water.