Polynucleotide separation and purification device

The utility model discloses a polynucleotide separation and purification device which comprises a separation tank, a stirring motor and a feed port are arranged at the top of the separation tank, a stirring rod is arranged on the stirring motor, a plurality of stirring blades are arranged on the stirring rod, purification cavities are symmetrically arranged on two sides of the separation tank, and an auxiliary stirring rod is arranged between the two purification cavities. The left end and the right end of the auxiliary stirring rod extend into the purification cavity and are fixed through a bearing seat, a plurality of auxiliary stirring blades are arranged on the auxiliary stirring rod, the auxiliary stirring rod and the stirring rod are in meshing transmission connection through a bevel gear, a discharging opening is formed in the lower portion of the purification cavity, and an electrode is arranged in the purification cavity; and the symmetrically arranged electrodes are opposite poles. By arranging the