Positioning type field rock sample sampling device and sampling method thereof

The invention belongs to the technical field of rock sampling, and particularly relates to a positioning type field rock sample sampling device and a sampling method thereof.The positioning type field rock sample sampling device comprises a bearing frame, two inner threaded sleeves, a rotating shaft, a movable plate and an ejector rod; the bearing frame comprises a bottom plate and vertical frames connected to the two sides of the upper surface of the bottom plate, the positions of the vertical frames on the two sides directly face each other, passing grooves are formed in the middles of the vertical frames, lead screws are rotationally connected into the passing grooves of the vertical frames on the two sides, and a through groove is formed in the middle of the bottom plate. The two internal thread sleeves are correspondingly connected to the lead screws on the two sides in a threaded mode respectively. Through the mode that two lead screws are driven to rotate synchronously, structures such as a bearing pla