Based on the specific iron concentrate ratio, detailed experimental studies on the preparation and metallurgical properties of magnesium acidic pellets are made by changing w(MgO). The results show that when w(SiO₂) is 5.5% and w(MgO) varies from 1.4% to 2.2%, w(MgO) has little effect on the spherization rate and green pellet strength of iron ore powder; the burst temperature of pellets decreases first and then increases, and is at the lowest when w(MgO) is 2.0%; the compressive strength shows a downward trend, with each increase of w(MgO) by 0.1%, the compressive strength decreases by 71.9 N/P; the tendency of low-temperature reduction and pulverization decreases first and then increases, with each increase of w(MgO) by 0.1%, reduction performance decreases by 1.6%, the overall softening performance is improved.