The utility model provides a polycyclic root zone geotome, include: the plate body, the multilayer sleeve is connected to the one side of plate body, and sleeve lock connection lid attaches together to be put. The utility model discloses a multilayer tube -in -tube structure, but the pedotheque of a plurality of lateral separations of simultaneous acquisition and fore -and -aft distance during the use, sleeve lock are connected the lid and are attached together and puts, are convenient for take out the soil between the different sleeves, the sample is accurate, have overcome prior art, and the pedotheque of fore -and -aft distance can only be gathered to ordinary geotome, and when gathering the pedotheque of same distance not, the easy disturbance of soil around the sample results in measured data unsafe not enough many times. The utility model discloses a structural design is simple, and is easy -to -use.