Tensioning tool for prestressed member

The invention discloses a tensioning tool of a prestressed component, the prestressed component comprises a prestressed tendon, a locking piece and a supporting seat, the locking piece and the supporting seat are arranged on the prestressed tendon in a penetrating and sleeving mode, the tensioning tool comprises a hydraulic cylinder with a center hole, a hollow bottom shell, a locking sleeve and a connecting piece, and the hydraulic cylinder comprises a cylinder body and a piston; the piston has an initial position for retracting into the cylinder body and a tensioning position for extending out of the cylinder body; the bottom of the bottom shell is provided with through holes for the prestressed tendons and the locking pieces to pass through, and the top is connected with the cylinder body, so that an internal cavity is communicated with the central hole; the bottom of the locking sleeve is supported on the bottom shell, and a butt-joint through hole and a sliding channel with the section shape matched with