The invention discloses a section settlement instrument and relates to the technical field of measurement devices for foundations or foundation structures. An accelerator assembly is fixed in a steel pipe shell and comprises an accelerator and a probe center shaft; the accelerator and the probe center shaft are positioned in the steel pipe shell, and the accelerator is fixed in the middle of the steel pipe shell; the probe center shaft is fixedly connected with the accelerator; a data acquisition device is fixed in one end of the steel pipe shell; the accelerator is connected with the signal input end of the data acquisition device; metal pull ropes are fixed at two ends of the steel pipe shell; one of the metal pull ropes is connected with the signal output end of the data acquisition device. The settlement instrument disclosed by the invention has the characteristics of high measurement accuracy, high working efficiency, long service life and the like.