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PURPOSE : A guard fence for ground reinforcement of a roadside and a construction method thereof are provided to secure stability by reinforcing a supporting force of the ground and a soil part to prevent soil form being collapsed. CONSTITUTION : A guard fence(100) for ground reinforcement of a roadside and a construction method thereof comprise a pillar(110), an emergency path(120), a support plate(130), nonwoven fabric(140), and a support plate(150). The pillar is installed on an inclined surface of the outer roadside of a guard rail(1) on a road(R). The emergency path is installed on the ground between the guard rail and the pillar with concrete. The support plate is connected to the inside of the embedded unit(112) of the pillar and is installed in the horizontal direction. The nonwoven fabric is arranged in the lower side of the support plate and is embedded in the ground in the horizontal direction. The support plate is connected to the lower end of the support plate.