Device and method for facilitating roller replacement of roller type straightening machine

The invention discloses a device and method for facilitating roller replacement of a roller type straightening machine. The device comprises a roller replacement trolley, the roller replacement trolley is an AGV trolley with a roller replacement function, and a motion control processor is arranged on the roller replacement trolley; the roller replacement trolley comprises a fixed end, a free end and a middle end, and the fixed end is fixed on a frame; a fixed end jack device is arranged in the middle of the upper part of a fixed end base; cylinders are arranged at two sides of the fixed end jack device; and a free end supporting head matched with a roller box side edge supporting point is arranged at the free end of the roller replacement trolley, a free end jack device is arranged below the free end supporting head, and a free end sliding block is arranged on a free end base. The middle end of the roller replacement trolley is located between the free end and the fixed end and provided with a roller box supp