Bolt hardness testing device

The invention discloses a bolt hardness testing device which comprises a testing auxiliary structure and a hardometer fixing structure, and the hardometer fixing structure can be fixed on the testing auxiliary structure. The testing auxiliary structure comprises an auxiliary measurement base, the auxiliary measurement base comprises a bottom plate, a left vertical plate is arranged on the left side of the bottom plate, a right vertical plate is arranged on the right side of the bottom plate, the inner wall of the left vertical plate is sunken outwards to form an arc-shaped clamping groove, and a movable fixing assembly is in threaded connection with the right vertical plate. The movable fixing assembly is matched with the arc-shaped clamping groove so that a bolt can be fixed to the auxiliary measurement base. The hardometer fixing structure comprises a movable hardometer support, a telescopic rod is arranged on the movable hardometer support, a trigger device is arranged at the top of the telescopic rod, a h