The present invention relates to a weed prevention device for a roadside, capable of effectively preventing growth of weed on the roadside. According to the present invention, the weed prevention device for a roadside comprises: weed prevention blocks (10) having a triangular shape with a horizontal bottom surface (11) facing the ground, a vertical surface (12), and an inclined surface (13) to be arranged and installed under a guardrail along the roadside by allowing the inclined surface (13) to face a road; and connection blocks (20) installed between the weed prevention blocks (10) to connect and fix the weed prevention blocks (10). Wing parts (15) protrude from left and right sides of the inclined surface (13) of the weed prevention blocks (10), and insertion grooves (21) inserted and coupled corresponding to the wing parts (15) are formed on the left and right sides of the connection blocks (21). Accordingly, the wing parts (15) are inserted into and coupled to corresponding insertion grooves (21), respectively, thereby allowing the weed prevention blocks (20) to be fixed with each other through the connection blocks (20). The wing parts (15) are removed from the insertion grooves (21) along a curved part of the roadside, thereby allowing the weed prevention blocks (10) to be installed in the curved part of the roadside.;COPYRIGHT KIPO 2018
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