Abstract: 12wt%Mg₂Si/A356-1.2wt%Fe Fe-rich recycled Al matrix composite was prepared. The effects of vibration frequency (100, 150, 200 Hz) and Mn to Cr mass ratio (0:1, 3:7, 1:1, 7:3, 1:0) of modifier on the as-cast microstructure and property were studied. The microstructure and tensile strength of the composite and A356-0.5wt%Fe recycled Al alloy after solid solution and aging were analyzed and compared. The results show that the mechanical vibration helped the refinement and even distribution of eutectic Si phase, Mg₂Si phase and Fe-rich phase in the unmodified composite, resulting in the improvement of tensile strength at room temperature of the composite. After modification with Mn/Cr, the Fe-rich phase changed from needle-like to fish-bone shape, granular or chinese-character shape. When Mn to Cr mass ratio was 1:1, the tensile strength at room temperature reached the maximum value of 125 MPa. At vibration frequency of 200 Hz and with Mn to Cr mass ratio of 1:1, α-Fe (Al₈Fe₂Si) phase with hexagonal crystal shape was formed in the composite after solid solution and aging, while in the A536-0.5wt%Fe recycled Al alloy formed β-Fe (Al₅FeSi) phase with monoclinic crystal shape. The tensile strength at room temperature and at 200, 300℃ of the composite was higher than those of the A536-0.5wt%Fe recycled Al alloy.