Method and device for drilling fragile rock core

The invention provides a method and a device for drilling a fragile rock core. The method for drilling the fragile rock core comprises the following steps: acquiring a first rock core; acquiring a pipe, wherein the inner diameter of the pipe is smaller than the outer diameter of the first rock core; cutting the pipe along the radial direction of the pipe to obtain an outer casing having a length not less than that of the first rock core; treating the side wall of the outer casing to form an axially-penetrating kerf on the side wall of the outer casing; penetrating the first rock core into theouter casing to fix the outer peripheral wall of the first rock core with the inner peripheral wall of the outer casing; cutting the outer casing and the first rock core simultaneously by the kerf tocorrespondingly divide the outer casing and the first rock core into a plurality of shells and a plurality of second rock cores, wherein each shell coats the corresponding second rock core to form a rock sample, and the cross-