PURPOSE: A drainage system for a steep mountain slope of a road is provided to dispose of underground water and rainwater from a slope smoothly. CONSTITUTION: The drainage system(200) for a steep mountain slope(110) of a road(100) comprises: a cover member(300) manufactured in the rectangular box shape using plastics such as P.E or P.P; a sump member(400) provided with a wing unit, a pipeline fitting hole and many fastening bolt holes; a drainage pipe(500) provided with a square contact unit and a hose unit and made of flexible materials; and a sump tank(800) and provided with a square contact unit, a drainage groove unit and a suction member placer for placing underground water/rainwater suction member.
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