Bolt pretightening force measuring jig

The utility model relates to the technical field of bolt testing, in particular to a bolt pre-tightening force measuring jig, which comprises a bottom plate, a top plate, a plurality of bolt groups of different models and an elastic component, the top plate is positioned on the bottom plate, the bottom plate is provided with a plurality of threaded holes of which the models correspond to those of the bolt groups, and the elastic component is positioned on the top plate. The top plate is provided with via holes located over the corresponding threaded holes, and the elastic assembly is located between the top plate and the bottom plate and used for applying elastic force to the top plate and the bottom plate. During measurement, bolts of the same type penetrate through the via holes in the top plate, the bolts are screwed into the corresponding threaded holes through a torque wrench, in the screwing process, the elastic assembly between the bottom plate and the top plate can be compressed to generate elastic fo