Clamping device for high-temperature tensile sample for metal sheet and use method of clamping device

The invention provides a clamping device for a high-temperature tensile sample for a metal sheet. The clamping device comprises a clamp body and a clamping part connected to the clamp body, wherein agroove is formed in one end, far from a threaded hole, of the clamping part; and a wedge-shaped gasket I, an annular gasket I, a sample, an annular gasket II and a wedge-shaped gasket II are sequentially arranged in the groove, a guiding slot I which extends downwards and has a U-shaped longitudinal section is formed in the top end of the wedge-shaped gasket I, a fixed block I is arranged at the bottom end of the wedge-shaped gasket I, a guiding slot II which extends downwards and has a U-shaped longitudinal section is formed in the top end of the wedge-shaped gasket II, a fixed block II is arranged at the bottom end of the wedge-shaped gasket II, and a fixed pin sequentially penetrates through the through hole I, the annular gasket I, a sample, the annular gasket II and a through hole IIso as to fix the sample to