External cable protecting device

An external cable protecting device relates to the fields of cable insulation and cable protection. The invention provides the external cable protecting device which has advantages of effectively prolonging service life of the cable after use, reducing danger coefficient, and realizing ordered cable arrangement. The external cable protecting device comprises a sleeve and a plurality of brackets. The sleeve comprises a pair of semicircular pipes which are oppositely arranged and are detachably connected. Each semicircular pipe has a section bar structure and has a semicircular cross section. One end surface of each semicircular pipe is provided with a pair of first arc-shaped projections, and the other end surface is provided with a second arc-shaped projection. A second arc-shaped recessed trough which matches the second arc-shaped projection is arranged between the pair of the first arc-shaped projections. Two sides of the second arc-shaped projection are provided with first arc-shaped recessed troughs which