In order to study characteristics and influence factors of corn straw mixture pellet feed forming process, the dense forming process of corn straw mixture pellet feed was simulated by discrete element software EDEM based on contact model Hysteretic Spring, and the influences of different factors such as cone angle, particle size and pressing speed on forming quality and energy consumption were analyzed. Then, the flow state of materials in the pressing process was tracked, and the compression experiment was conducted to compare and verify between simulation data and experimental data. The results show that the quality of the formed feed increases with the increasing of the cone angle, and the specific energy consumption is higher at the same time. Increasing the particle size reduces, the specific energy consumption decreases in the forming process, but the quality of the formed feed reduces too. With the increasing of the pressing speed, the quality of the formed feed becomes worse, and the specific energy consumption becomes higher. In the forming process, the relative fluidity between materials is poor, and the uniformity of the feed before pressing should be improved. Under the condition of significance level α=0.05, there is no obvious difference between simulation data and experimental data, which verifies the accuracy and feasibility of the simulation method. Thus, the simulation results can provide data reference for the development of dense forming technology for mixture pellet feed such as corn straw.