The utility model discloses a mid-voltage and high-voltage direct current intelligent cable having an online monitoring function. The intelligent cable comprises a cable core and an outer sheath which are arranged from inside to outside, and also comprises filler disposed between the cable core and the outer sheath. The cable core comprises two insulation cores, and each insulation core comprises multiple conductors, a conductor semi-conduction shield, an insulation layer special for a direct current cable, an insulation semi-conduction shield and a metal shield which are arranged from inside to outside. The two insulation cores are parallelly arranged. The filler comprises an upper filling portion arranged at the upper portion of the cable core and a lower filling portion arranged at the lower portion of the cable core, and also comprises a metal shield side temperature measuring unit arranged at the upper filling portion and a communication optical unit arranged at the lower filling portion. A flat 8-shaped structure is formed by the two insulation cores, and the communication optical unit and the online temperature measuring unit are arranged at the two filling portions of the cable, so that the direct current intelligent cable has an optical communication function and an cable operation temperature online measuring function as well, and therefore the operation research capability and safety control capability of the direct current able are greatly improved.