The dissemination size of magnetite and hematite of an iron ore in Pakistan is fine, so it is difficult to obtain high-grade iron concentrate through magnetic separation. Based on the systematic mineral processing research to the beneficiation process of an iron ore in Pakistan, the process of stage grinding and stage separation is determined in order to improve the grade of concentrate. The process of improving its concentrate grade, that is "two stages of grinding, one stage of magnetic separation and discarding tailings, and two stages of reverse flotation", is adopted during the whole process test, while a good beneficiation index with an iron grade of 62.84% and an iron recovery rate of 70.04% is obtained.