The present invention relates to a stainless drainage trench, and serves to induce drainage of sewage into a trench drainage passage 50 installed at one side of a floor such as a bathroom or a toilet, and a metal material on the upper surface of the trench drainage passage 50. In the drain trench having a drainage cover (20), the trench type drainage passage (50) comprises: a stainless circular pipe having an upper surface (51) having an upper portion and having a space covered by the drainage cover (20); A water tank unit 52 formed integrally with a lower portion of the upper surface 51 and formed in a circular tube shape so as to be inclined while increasing in diameter from one side to the other side; A closing part 53 welded to cover one side of the water tank part 52; A drain part 55 covering the other side having a larger diameter than the one side and having a drain pipe connection part 54 of the same level as the bottom of the other side; A welding joint member 57 having spot welding portions formed at both sides of the water tank portion 52 in the width direction to insert members at upper and lower portions thereof, and having holes 57a formed at the center thereof; It is characterized in that it comprises a plurality of horizontal surface holding member 56 for maintaining the upper surface 51 is inserted while supporting through the insertion hole of the welding coupling member 57. Since the present invention is parallel to the surface horizontal plane of the stainless drainage trench in which a constant gradient is formed by the horizontal plane holding member 56, the gradient is automatically made by simply placing the stainless drainage trench on a flat base bottom. It is a useful invention that the grading operation is simple and easy and has an efficient and economic effect.
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