Clamping rig used for mounting embedded bar on surface of upright

The utility model belongs to the technical field of building construction, and relates to a clamping rig used for mounting an embedded bar on the surface of an upright, in particular to a clamping rig used for mounting an embedded bar on the surface of an upright of a retaining wall. The clamping rig is characterized by comprising a formwork (2), a rubber pad retaining component and a fastening component, an integral longitudinal section of the rubber pad retaining component is T-shaped, the rubber pad retaining component is mounted in an inner hole of the formwork (2), a left inner end face of the rubber pad retaining component contacts with the formwork (2), the right end of the rubber pad retaining component penetrates into the inner hole of the formwork (2) and is in threaded connection with the fastening component mounted on the other side face of the formwork (2), a through hole is arranged inside the rubber pad retaining component, and the embedded bar (1) is mounted in the through hole, one end of the