The invention specifically provides a cable-hanging operating vehicle on the sidewall of a railway tunnel, solving the problem of high labor intensity because no cable-hanging devices on the sidewall of the railway tunnel exist at present and the cables have to be laid by labor. The vehicle comprises a base supported on a track; a support which is obliquely arranged corresponding to the sidewall of the railway tunnel is fixed on the base; a connecting block is fixed at the other end of the support; a universal wheel contacted with the sidewall of the railway tunnel is arranged at the front side of the connecting block and a pulley contacted with the sidewall of the railway tunnel is arranged at the rear side of the connecting block; and a setting pulley is hung at the lower end of the connecting block via a steel wire rope. The vehicle supplies a gap that no cable-hanging devices on the sidewall of the railway tunnel exist at present, thus solving the problem of high labor intensity because the cables are laid by labor and greatly improving the production efficiency; besides, the vehicle is comparatively light and can be conveniently elevated so as not to affect the railway cars to pass through, and has the advantages of simple structure, convenient operation, low cost, etc.