The utility model discloses an improved roller of a roller-type magnetic separator, which belongs to the technical field of dressing equipment, is used for effectively protecting the surface of the magnetic roller, and simultaneously can be used for effectively recycling the magnetic materials and reducing the dosage of mine unloading water. The technical scheme is that a baffle plate is arranged on the outer surface of the roller, wherein the baffle plate is a rectangular plate bar; the plate surface of the baffle plate and the outer surface of the roller form an included angle of 45 degrees to 90 degrees; the long side of the baffle plate is axially parallel to the roller; at least one baffle plate is uniformly distributed along the outer surface of the roller; and the baffle plate is 0.5-3.0cm in height and manufactured by non-magnetic materials. The improved roller of the roller-type magnetic separator provided by the utility model has the beneficial effects of effectively protecting the surface of the magnetic roller, prolonging the service life of the roller, improving the recovery ratio and effectively recycling and utilizing the magnetic material; and moreover, the dosage of the mine unloading water can be reduced, and the water resources are saved.