Pore water pressure sensor protection device

The utility model discloses a pore water pressure sensor protection device. A conical drill is formed at one end of the barrel; a plurality of strip-shaped holes are formed in the cylinder body; the length direction of the plurality of strip-shaped holes is parallel to the length direction of the barrel body; the multiple strip-shaped holes are formed in the circumferential direction of the barrelat intervals. A sliding groove is formed in the position, located between any two adjacent strip-shaped holes, of the inner wall of the cylinder body, the length direction of the sliding groove is parallel to the length direction of the cylinder body, the multiple permanent magnets are embedded in the inner wall of the sliding groove and arranged at intervals in the length direction of the sliding groove, and the sliding piece is arranged in the sliding groove in a sliding fit mode and made of a strong magnetic material; the conical drill bit of the cylinder body is downwards inserted into apre-dug hole; when the por