The invention discloses a three-dimensional force static rigidity measuring instrument device. According to the features of a process system and a structure, an arch-shaped structure is adopted, a through groove is formed in the arch-shaped structure, a locking sleeve is adopted in a structure connected with a tailstock of a lathe and provided with a T-shaped annular groove structure, and fastening connection of the device and a right shaft table is conducted through symmetrical tapered bolts. According to the three-dimensional force static rigidity measuring instrument device, the required functions can be achieved, the through groove is formed in an arch-shaped body, scales are engraved on the arch-shaped body, a stress application screw sleeve and a butterfly-shaped nut can be fixed at any angle when being matched, and a stress application screw can apply load in the stepless direction. When the load is applied, under the action of a thrust ball bearing, it is guaranteed that the position of a force measuring sensor is fixed. The locking sleeve is provided with the T-shaped annular groove, the scales are engraved, and the tapered bolts are connected with the right shaft table, so that the tapered faces of the tapered bolts are attached to the tapered hole face of the right shaft table. The symmetrical tapered bolts are adopted in the structure, and the radial stability is improved when force is applied. In this way, the accuracy of the device is improved.