The utility model discloses a both arms support formula scale device, including the roll table, be located the movable baffle frame above the roll table, be located the guide rail of roll table both sides respectively, the movable baffle frame is in by drive arrangement drive back -and -forth movement on the guide rail, from the last baffle that inserts under to in the movable baffle frame, the baffle is in by the drive of the 2nd drive arrangement reciprocate in the movable baffle frame. The theory of operation is at roll table production line afterbody both sides installation base and guiderail, an installation drive arrangement on the base, and a drive arrangement connects the movable baffle frame, the movable baffle mounts baffle, the baffle is connected with the 2nd drive arrangement, and a during operation drive arrangement promotes the movable baffle frame and moves the assigned position location, and the baffle reciprocates under the 2nd drive arrangement's drive, carries outthe scale to the rolled piece. A location, positioning accuracy is high that is used for mill bar production line finishing process, mainly carries out the accuracy for the rolled piece .