The invention relates to a low-position illumination lamp for a tunnel. The low-position illumination lamp is installed at the position, which is 1.0 mm to 1.5 mm away from the ground, of a wall of the tunnel; a reflection cup comprises two parabola arc faces and one free arc face, the free arc face is connected between the two parabola arc faces, the two parabola arc faces are different in shape, and the lengths of the two parabola arc faces are both larger than the length of the free arc face; the length of the parabola arc face close to the lower portion of a lamp body is larger than the length of the parabola arc face close to the upper portion of the lamp body; and an included angle between a lamp source and a flat plate on the back of the reflection cup ranges from 64 degrees to 66 degrees. After light is emitted by the lamp source is reflected by the reflection cup, a lighter light band and darker light bands are formed, the darker light bands generated by illumination lamps on the walls on the two sides of the tunnel are overlapped together, the luminance of the overlapped darker light bands is basically the same as the luminance of the lighter light band, low-position even illumination on the road surface of the tunnel is achieved, and the national standard requirement is met. Meanwhile, the illumination energy consumption is obviously reduced, and the problem of glaring is solved.