Outer wall cutting device for soft clay based hollow cylindrical test sample and use method of outer wall cutting device

The invention discloses an outer wall cutting device for a soft clay based hollow cylindrical test sample and a use method of the outer wall cutting device. The device comprises an external support, a screw rod, a driving device, a test sample fixing device and a test sample cutting device, wherein the screw rod is arranged in the external support, the bottom end of the screw rod is rotationally supported to a bottom plate, and the upper end of the screw rod is connected with the driving device; the test sample fixing device is connected onto the screw rod and can rotate from top to bottom in the rod axis direction of the screw rod when the screw rod rotates, the test sample cutting device is arranged in the rod axis direction of the screw rod, the screw rod is driven by the driving device to rotate so as to drive the test sample to rotate from top to bottom, and when the test sample passes through the cutting device, the cutting device cuts the outer wall of the test sample. According to the outer wall cutti