Special drafting spinning mechanism for spinning frame

The invention relates to the technical field of spinning frame equipment, in particular to a special drafting spinning mechanism for a spinning frame. The technical scheme includes that a rear roller,a middle roller and a front roller can be controlled and driven by individual motors, a cradle is arranged on upper sides of the rear roller, the middle roller and the front roller, at least one endof each roller body is provided with a large-diameter section and a small-diameter section, the widths of the large-diameter sections correspond to the widths of the small-diameter sections, the large-diameter sections and the small-diameter sections on a first upper leather roller and a second upper leather roller are correspondingly arranged in a staggered manner, the second upper leather rolleris mounted on an upper pin of the cradle in a fixedly connected manner, a first leather collar is wound on a leather roller wheel of the second upper leather roller and the upper pin, a tension frameis mounted on the cradle, a