The utility model discloses a limiting device for a hardness test of a clamping piece of a prestressed concrete construction steel strand anchorage device, relates to an auxiliary tool for testing anddetecting the clamping piece of the prestressed concrete construction steel strand anchorage device, and particularly belongs to a limiting device for carrying out the hardness test of the clamping piece of the anchorage device by using a durometer. Wherein the longitudinal adjusting mechanism and the lateral adjusting mechanism are arranged above the base. The longitudinal adjusting mechanism comprises a front baffle, a rear baffle and a cushion block unit, wherein the front baffle and the rear baffle are arranged at the front end and the rear end of the base. Wherein a threaded hole is formed in the rear baffle, the pressing screw is matched with the threaded hole, a top plate is arranged at the end, penetrating through a rod body of the rear baffle, of the pressing screw, and the top plate is in surface contact with the cushion block unit. And the fastening screws are matched with fastening nuts mounted below the base so as to realize connection and fixation of the side baffles onthe base. The device has the positive effects of being high in practicability, improving the placement stability of the clamping pieces and being high in hardness test result accuracy.