Sleeve type skin tissue punching sampler

The utility model provides a casing pipe type skin tissue punching sampler which comprises a casing pipe positioning piece, the casing pipe positioning piece comprises a grab handle section, an exposing section and a positioning section which are sequentially connected end to end from top to bottom, a first through hole and a second through hole which are arranged in the axial direction and communicated with each other are formed in the grab handle section, the positioning section is cylindrical, and the first through hole and the second through hole are communicated with each other. A third through hole is formed in the positioning section in the axial direction; the sampling piece is in a round rod shape and can be movably arranged in the sleeve positioning piece in a penetrating and inserting mode, a first limiting part is arranged on the sampling piece, the first limiting part can be clamped on the positioning section, and the distance between the first limiting part and the other end of the sampling piec