The utility model discloses a prestressed tensioning pedestal belonging to the bridge construction field, which comprises a pedestal body and an external limiting device. The pedestal body comprises a first bearing plate, a transverse partition plate, a second bearing plate, a bottom plate and a top plate. The first bearing plate and the second bearing plate are in parallel arrangement and are vertically fixed at the two ends of the bottom plate. The middle parts of the first and second bearing plates are provided with corresponding rib piercing slots. The external limiting device comprises a fixed plate and a rib piercing box. The fixed plate is provided with an installing hole. The rib piercing box is fixedly arranged in the installing hole. The rib piercing box is in the form of a hollow cuboid, wherein the hollow cuboid is formed through the welding of steel plates. The front and rear end surfaces of the rib piercing box are provided with a rib piercing hole respectively, wherein the two rib piercing holes are positioned at the same locations of the front and rear end surfaces. According to the technical scheme of the utility model, the body of the prestressed tensioning pedestal is formed through the welding of steel plates and can be moved and conveyed according to on-site conditions. Meanwhile, due to the adoption of the assembly type limiting device, on the premise that the positioning accuracy of the finish-rolling threaded steel is ensured, the construction speed is accelerated. In addition, the prestressed tensioning pedestal is simple in structure and convenient in operation.