The invention provides an easily attached optical cable comprising a sheath. The cross section of the sheath is flat, and the length value of the cross section of the sheath is 3-5 times of the width value. The beneficial effects of the easily attached optical cable are that the sheath is arranged to be flat, and the length value of the cross section of the sheath is 3-5 times of the width value so that the easily attached optical cable is enabled to be matched and attached to the surface of a circular pipeline. Meanwhile, the coated optical fiber is in the spirally bent state, and the temperature change can be more accurately distinguished by the optical signal of the optical cable. The tight buffered tube of the tight buffered optical fiber and the sheath have the same material, and the sheath and the tight buffered tube are adhesively connected when the sheath is extruded so that the optical cable is enabled to be compact in structure and high in uniform degree, and the strain change can be accurately distinguished by the optical signal of the optical cable.