Steel bar fixed-length cutting machine

The utility model relates to the technical field of cutting devices, in particular to a steel bar fixed-length cutting machine. A fixed-length conveying structure is additionally arranged, meanwhile, a straightening structure is additionally arranged, the phenomenon of manual fixed-length conveying of the steel bars is reduced, the perpendicularity of the steel bars is improved, and the cutting difficulty is reduced; comprising a first bottom plate, two first rotating shafts and two second rotating shafts, two first connecting shafts are arranged at the right end of a right supporting plate, first gears are fixedly arranged at the right ends of the two first connecting shafts, a first bevel gear is fixedly arranged at the left end of the left first rotating shaft, and a second bevel gear is arranged at the bottom end of the first bevel gear in a meshed mode; second gears are fixedly arranged at the bottom ends of the two sets of second rotating shafts, a third gear is fixedly arranged at the bottom end of the