The invention relates to a flame-retardant indoor transparent beautifying optical cable having little influence on original indoor decoration. The optical cable comprises an uncolored optical fiber and an outer sheath, wherein the optical fiber meets G.657 criteria, the cross section of the outer sheath is circular, rectangular or elliptical, and the outer sheath is made of a polyether-type thermoplastic polyurethane material; the optical fiber is arranged in the outer sheath; and the indoor transparent beautifying optical cable does not comprise a reinforcing member.