The utility model relates to a novel radial online coping instrument of high accuracy, including hammer stem and rotation support, the last leveling screw that is provided with of rotation support, the rotation support center sets up the rotation axis, and rotation support passes through rotation axis and the cooperation of hammer stem centre bore, and rotation axis and the solid of revolution antifriction bearing in through the solid of revolution cooperate, and the rotation axis wraparound is turned and is rotated, the swinging boom is connected at the both ends of the solid of revolution, and swinging boom one end is passed through the bolt and is linked to each other with the bottom plate, and the other end passes through the bolt and links to each other with the solid of revolution, the swinging boom passes through bolted connection counter weight device, counter weight device and the installation of tool combination body symmetry, and the tool combination body is fixed on the mounting plate, all is provided with the mutual mating guide way of vertical direction on mounting plate and the bottom plate. An object of the utility model is to provide a novel radial online coping instrument of high accuracy, furthest reduces equipment down time and alleviates personnel intensity of labour, avoids the forging product processing quality problem because of the hammer stem wearing and tearing cause simultaneously.