The invention relates to a jacket type permanent-magnet separating arrangement, comprising magnetic columns arranged according to certain rule and a jacket enclosing the outboard of the magnetic column, wherein each of the magnetic column is connected with a magnetic column mounting plate, forming the magnetic field portion of the separating arrangement, and each of the magnetic column is connected with another magnetic column mounting plate, forming the enriched portion of the separating arrangement, said arrangement is placed into the fluid to be separated to make the fluid flow through the arrangement, thus the magnetic particles in the fluid are absorbed on the outer wall of the magnetic column jacket, achieving the goal of separating magnetic particles.