The invention discloses a polymer dispersing device and belongs to the technical field of oil extraction. The polymer dispersing device comprises a material filling bin, a stirring mechanism, an oscillator and a material discharging mechanism; a material feeding through hole is formed in the top end of the material filling bin; the oscillator is positioned on the external wall of the material filling bin; the material discharging mechanism communicates with the bottom end of the material filling bin; the stirring mechanism comprises a stirring motor, a stirring piece, a rotating shaft, a controller and a stirring rod position information collector; the stirring piece comprises a rotating piece and a stirring rod; the stirring motor and the rotating shaft can be connected in an up-and-downmoving piece; one end of the rotating piece is connected with the rotating shaft; the other end of the rotating piece is connected with the stirring rod; a scraping plate is arranged on the stirring rod; the scraping plate abuts against the internal wall of the material filling bin; the controller comprises a rotating shaft displacement controller and a stirring rod scraping plate switcher; one end of the rotating shaft displacement controller is connected with the stirring motor; the other end of the rotating shaft displacement controller is connected with the stirring rod position information collector; and the stirring rod scraping plate switcher is connected with the stirring rod. The polymer dispersing device disclosed by the invention has the advantage that the dispersion efficiencyof polymer supermolecule particles discharged by the material discharging unit is enhanced.