The invention discloses a
cartridge for purifying a PCR product. A through hole is formed in an upper cover of the
cartridge, a magnetic sheath is arranged in the through hole, an annular bulge is arranged in the middle of the magnetic sheath, a spring is sheathed on the magnetic sheath on the lower part of the annular bulge, a
metal bar is arranged in the magnetic sheath, a sphere with the
diameter slightly smaller than the inner
diameter of the magnetic sheath is arranged at the bottom of the
metal bar, the upper end of the
metal bar extends out of the upper cover, the lower end of the metalbar is inserted in the bottom of the magnetic sheath, and the metal bar can drive the magnetic sheath to move up and down; and a plurality of centrifugal pipes are arranged on a base. Under the action of an outside
magnetic field, the metal bar can generate
magnetism which can be completely eliminated after the outside
magnetic field is removed. Through the up-down movement of the metal bar and the magnetic sheath, the grab and release of magnetic beads can be completed, the capture, washing and rinsing of
nucleic acid can be realized through simple operation, and finally, the purified PCR product can be obtained, the influence of
aerosol escape generated during the purification process of the PCR product on the environment can be avoided.