Nol ring shearing clamp with high centering precision

The utility model discloses a Nol ring shearing clamp with high centering precision. The Nol ring shearing clamp comprises a fixed base, a clamping piece and a clamping piece, wherein the fixed base is provided with a positioning surface; the pressure head is movably matched with the fixed base along a second direction; the two first guiding and limiting structure groups are arranged on the positioning surface at intervals in the first direction, and each first guiding and limiting structure group comprises at least two first guiding and limiting structures which are arranged at intervals; the two supporting heads are correspondingly matched with the two first guide limiting structure sets respectively, the two ends of a sample to be tested can be located on the two supporting heads respectively, and the first direction and the second direction are perpendicular to each other and are both parallel to the locating face. The Nol ring shearing clamp provided by the utility model is more stable in structure, the