Field soil layer specimen collecting and manufacturing device and use method thereof

The invention discloses a field soil layer specimen collecting and manufacturing device and a use method thereof. The field soil layer specimen collecting and manufacturing device comprises a bottom plate, a stand column is rotationally connected to the bottom plate, a sampling barrel is vertically and slidably connected to one side of the stand column, a U-shaped surrounding plate and a cutter are detachably connected to one side of the sampling barrel, and a supporting plate is fixedly connected to the side, close to the surrounding plate, of the sampling barrel; slotting tools are arranged on the side wall of the supporting plate and located at the upper end and the lower end of the surrounding plate. The surrounding plate is directly inserted into soil through the sampling barrel, the soil in the surrounding plate is directly cut to be moderate in thickness through the cutter, it is avoided that a large amount of time and manpower are consumed for digging a pit during sampling, the soil sampling device ca