Locking and unlocking device of sampling tube in hollow drill pipe

The utility model relates to a locking and unlocking device of a sampling tube in a hollow drill pipe, which comprises a rope, a metal counterweight block, steel wire flexible shafts, sampling tube locking slide blocks, a sliding chute transition block, a sampling tube connector, a sampling tube, an anti-leakage petal and a metal hollow drill pipe. The metal hollow drill pipe is provided with the rope, the metal counterweight block, the steel wire flexible shaft, the sampling tube locking slide block, the sliding chute transition block, the sampling tube connector and the sampling tube from the top down in sequence. The rope is connected with a winch, the top of the sampling tube is provided with the sampling tube connector, the sliding chute transition block is provided with four groups of slide chutes in parallel in 90 degrees, steel wire flexible shafts and sampling tube locking slide blocks are distributed symmetrically in four groups in the sliding chute transition block, the inside of the last section of the metal hollow drill pipe is provided with a sampling tube locking groove, the lower end of the metal hollow drill pipe is provided with a sampling tube support barb, and the lower portion of the sampling tube is provided with the anti-leakage petal. The core-taking of the soil and the sediment can be achieved without raising the drill so as to improve efficiency of drilling core-taking.