Floating type stretch-bending straightening machine

The utility model discloses a floating type stretch bending straightening machine which comprises a rack formed by connecting an upper rack and a lower rack, the left side of the rack is hinged through a rotary unit, a tensioning opening oil cylinder is arranged at the end of the rack, and rotary locking oil cylinders are longitudinally and symmetrically arranged on the right side of the lower rack in a front-back mode and lock the rack through matching with a window preset on the upper rack. A bending unit, a flattening unit and a parallel roller type straightening unit which can float up and down are sequentially arranged at the combination position of the machine frame at intervals in the direction from an inlet to an outlet. In addition, a deflection adjusting mechanism and an anti-backlash mechanism are arranged at corresponding positions in the machine frame. Through cooperation of the bending unit and the leveling unit, not only can the plate strip be subjected to large elongation rate, but also variou