A sort of automatic wire-ranking machine for reel cart of mining dispatching, it essentially consists of cable wire guide wheel, lead screw shaft of guide wheel or slide lever, internal gear fixed on main driving wheel of reel cart, input gear and gear box etc. The gear box consists of gear driving-motion mechanism, automatic direction-changing mechanism and random direction-changing mechanism or clutch mechanism. Guide wheel of cable wire consists of inner circle and outside circle, the inner circle moves leftwards and rightwards on lead screw shaft or slide lever, the outside circle rotates around inner circle. Automatic direction-changing mechanism of gear box consists of castellated shaft of automatic direction-changing, gear of automatic direction-changing, lead screw shaft of automatic direction-changing, 2 screw nuts moving leftwards and rightwards, stand-swinging board, stand-pulling spring, flat-swinging board and flat-swinging spring, etc.; it can also consists of peach-like cam of gear box output shaft, roller wheel of propelling gear rack board of peach-like cam, gear rack board and roller wheel of fixed gear rack board, etc. It solves the big problem of automatic wire ranking of dispatching reel cart, it can be directly combined with dispatching reel cart, its manufacturing and installation is simple, the utmost variable angle reaches 25 degree. It can be used in mine and constructions, ect.