The invention relates to a sleeve for biological sample in-vitro purification treatment. The sleeve comprises a pipe body, multiple movable baffles, a connecting shaft, a sealing ring and a coaxial locking switch, wherein the pipe body is cylindrical, a flange is arranged at the upper end of the pipe body, multiple first openings are formed in the end face of the bottom of the pipe body, and multiple second openings and convex blocks are arranged at the bottom end of the side wall of the pipe body; the sealing ring is sleeved on the outer side of the second openings; the movable baffles are arranged at the bottom of the pipe body, are of an annular fan shape and are provided with multiple third openings, and the outer edges of the third openings are in one-to-one correspondence with the second openings and are contacted with the sealing ring; the connecting shaft is positioned at a central position of the pipe body, the top end of the connecting shaft is connected with the coaxial locking switch, a polygonal part is arranged at the bottom end of the connecting shaft, and the edges of the polygonal part are in one-to-one correspondence with the inner edges of the movable baffles; the coaxial locking switch is positioned on the upper surface of the flange of the pipe body and can rotate. The sleeve provided in the invention is a device which is convenient, practical, low in production cost, simple in production process, safe and non-toxic and is used for biological sample in-vitro treatment.