The utility model relates to a multiple-roller straightening machine device for pipe/bar material, particularly a whipping control device for straightening pipe/bar material. The utility model solves the technical problems of scratch of the outer surface of the pipe/bar material and serious abrasion of a lining of the whipping control device. The scratch is caused by the existing whipping control device. The utility model has the technical scheme that a whipping control device for straightening pipe/bar material is composed of a machine frame, an air cylinder, a pressing roller fixing frame, a pressing roller, a sliding shaft, a slant roller, a slant roller supporting frame and a flexible air bag, wherein a lifting positioner is fixed on the machine frame and is connected with the pressing roller fixing frame, the air cylinder is vertically connected with the pressing roller fixing frame, the pressing roller is fixed on the pressing roller fixing frame, the pressing roller fixing frame and the air cylinder are glidingly connected with a sliding guide rod through a connecting arm, the slant roller is fixed on the slant roller supporting frame below the pressing roller and the lower part of the supporting frame is provided with the flexible air bag connected compressed air. The roller shape of the slant roller is completely identical to the roller shape of a straightening roller, and the rotation angle of the slant roller accords with the rotation angle of the straightening roller. The utility model is mainly used for the straightening whipping control of the pipe/bar material.