The utility model belongs to the technical field of ground process monitoring, a ultra -soft dredger fill layering sedimentometer is related to, subside device, dipperstick, probe and receiving from ground appearance including subsiding pipe, bellows, magnetism, the bellows jecket dress is subsiding the pipe outside, magnetism is subsided the device suit and can be reciprocated freely on the bellows on the bellows, the probe inserts the receiving from ground appearance through the dipperstick, the probe is arranged in and is subsided the pipe and reciprocate freely inside subsiding the pipe. The utility model provides a do not receive the restriction of dredger fill intensity, be not applicable to the long -term observation and have the high accuracy and high sensitivity's ultra -soft dredger fill layering sedimentometer.