Abstract: To increase the compaction density of the powder metallurgy products, the vibration was used to promote the movement and rearrangement of the iron powder particles, reduce the porosity of powders, and improve the packing density of powders. The vibration packing process of pure iron powders in the cavity was numerically simulated by the EDEM discrete element software. The influences of vibration frequency, vibration amplitude, and vibration time on the packing density of the powders were studied, the optimal technological parameters were determined, and the reliability of simulation was confirmed by the comparative experiment. The results show that, the packing density of powders is significantly influenced by the vibration frequency and amplitude. With the increase of the vibration frequency and amplitude, the packing density firstly increases, and then reduces; with the increase of the vibration time, the packing density firstly increases, and then tends to be stable.