The utility model relates to a prestressing force stretch -draw auxiliary assembly, including jack storage plate, jack storage plate bottom both ends welding support body pillar, support body pillar outside is equipped with the pillar outer tube, pillar outer tube bottom is equipped with the bed plate, the bed plate below is equipped with bottom pulley, jack storage plate, the support body pillar, the pillar outer tube, the bed plate forms an inner chamber, interior intracavity is equipped with the formula of cutting elevating gear, it fixes on jack storage plate's lower surface to cut formula elevating gear's upper end, it fixes on the upper surface of bed plate to cut formula elevating gear's lower extreme, use prestressing force stretch -draw auxiliary assembly to rise to tooth piece below with the jack, wear out steel strand wires in the jack, then move the jack to in ground tackle the place ahead and go up and down, the utility model discloses to the corresponding auxiliary assembly of continuous beam roof beam portion bottom plate tooth piece stretch -draw preparation, make things convenient for the maneuverability of bottom plate tooth piece stretch -draw, the efficiency of work is improved, lower step of process construction, reduction of erection time are accelerated to the can also in the construction.