The utility model discloses a clamp of an SRP systematic grinding machine, which comprises a sleeve, a grinding block and a grinding head. The grinding block is arranged in the sleeve, the grinding head is arranged on the bottom of the grinding block, and a rubber layer is jacketed on the outer surface of the sleeve. The utility model can be used for obtaining samples for testing of spreading resistors with smooth slopes, and the resistivity and curves or data of carrier concentration and depth obtained by testing the samples are smoother and more reliable, thereby ensuring the accuracy and repeatability of the measurement data.