The invention relates to a non-magnetic material processing device, in particular to a clamping tool for fixing non-magnetic materials onto a flat grinder. The clamping tool comprises a limit frame, a barrier strip and a connecting component, wherein the connecting component is used for connecting the limit frame with the barrier strip, and the limit frame is made of ferromagnetic materials and comprises a left frame strip, a right frame strip and a bottom frame strip for connecting the left frame strip with the right frame strip. The left frame strip and the right frame strip are positioned on the same side of the bottom frame strip and mutually parallel, the barrier strip is made of non-magnetic materials, two ends of the barrier strip are slidably connected with the left frame strip and the right frame strip respectively, the lower surface of the left frame strip, the lower surface of the right frame strip and the lower surface of the bottom frame strip are sucked with the flat grinder, the barrier strip and the bottom frame strip are used for clamping machined workpieces, and the connecting component is used for limiting the barrier strip to slide along the direction far away from the bottom frame strip. The clamping tool is applicable to clamping workpieces in various shapes and with various thicknesses, smoothness of the surfaces of the workpieces and clamping stability can be ensured, and working efficiency is greatly improved.