The utility model provides a device is strained to roll -type powder magnetism relates to medicine production and makes technical field. This device is strained to roll -type powder magnetism includes funnel, dustcoat, deflection baffle, magnetism roller, first export, second export, third export, scraper blade and liquid stream groove, the magnetism roller is arranged in adsorbing the iron powder end of powder, the funnel be used for to the inboard powder of introducing of dustcoat, the baffle that deflects is used for changing the vertical decurrent flow direction of powder, first export the third export is used for collecting powder, the second export is used for collecting absorbent iron powder end on the magnetism roller face of cylinder, the scraper blade is used for scraping off iron powder end on the magnetism roller, the liquid stream groove is used for introducing the fluid and washes away the iron powder end. The utility model discloses a device is strained to roll -type powder magnetism utilizes and deflects the baffle with the face of cylinder of powder with inclination flow direction magnetism roller to powder directly falls into the export from the face of cylinder bounce -back of magnetism roller, simultaneously, the iron powder end can be washed away conveniently in the liquid stream groove, avoids appearing the raise dust.