The utility model discloses a straightener roll changing mold plate, mainly consisting of a bottom seat, locating sleeves, a locating pin. Round sleeve holes are arranged side by side on the bottom seat for placing the locating sleeve, The locating sleeves are ring-shaped and is placed into the round sleeve holes, loose fit is between the locating sleeve and the round sleeve holes, the locating pin is arranged on the position sleeve, and one end of the locating pin extends into the inner diameter of the locating sleeves. When the roll needs to be replaced, after sleeving the mold plate in the straightening roll spline, adjust the relative position of the locating sleeves and the straightening roll spline tooth, arrange the roll in the locating sleeves with the locating pin, and move up and down to embed into the straightening roll spline tooth, at the moment, fasten the locating sleeves and the locating pin, and finish the location of the whole roll system. Therefore, the problem that the inaccurate tooth shape location and the difficult matching between the spline and a bushing when replacing the straightener roll is easily solved based on the mold plate, thereby promoting the roll replacing accuracy, realizing quick roll replacement, reducing roll replacing time, and promoting the operating efficiency.