The present invention relates to a coastal erosion-preventive coastal structure, comprising: a plurality of submerged blocks provided on a seafloor surface at a distance from the coast to have a predetermined length, width and height and attenuate a wave transmitted through water; A plurality of files formed by extending a part of the submerged blocks to the sea bed surface, A float type sofa which floats above the water surface in a state in which a plurality of floats are coupled to each other via flowable coupling means so as to attenuate the wave of waves formed along the sea surface; Wherein the folded sofas are folded and lifted together with the floating sofa, the folded sofas are folded and folded over the folded sofas, A plurality of file guiders coupled to each other to enable the floating soap to automatically rise and lower in response to a change in height of sea level; And a plurality of flowable coupling means for fluidically coupling the corner portions of the float and the pile guiders having mutually adjacent states. Therefore, it is possible to minimize the use of relatively expensive clay block compared to the production cost of floating sofa, and to minimize the installation cost of the coastal structure to prevent coastal erosion and to reduce the energy (i.e., wave power) Can be canceled in a double manner through a submerged block and a floating type of sofa, that is, the wave and the wave can be effectively quenched, thereby effectively preventing coast erosion.
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