Construction method of double-layer slag-proof floor drain

The invention discloses a construction method of a double-layer slag-proof floor drain. The double-layer slag-proof floor drain is obtained first, and comprises an upper floor drain and a lower floordrain arranged up and down, an arc-shaped arch cover is arranged below a surface cover of the upper floor drain, an adjustment stud is fixed on the lower surface of the surface cover, and passes through the arc-shaped arch cover, and an adjustment nut is arranged on the adjustment stud and is positioned below the arc-shaped arch cover in a thread fit manner. During the construction process, the arc-shaped arch cover is closed in an upper cup body to cover a pipe orifice of an upper water pipe, so as to avoid the falling of debris, and after the construction is completed, the arc-shaped arch cover is abutted on the surface cover by the adjustment nut, and the arc-shaped arch cover leaves the inner bottom surface of the upper cup body, so that normal drainage can be performed. The construction method is simple in co