Biomass densification technology can compress crushed crop straws and other materials into blocks, rods, and granular fuels of a certain length and density under certain external forces, temperatures, and humidity conditions. As a micromechanical analysis method for granular materials, the discrete element method has been widely used in the field of biomass densification. This article analyses the application of the discrete element method in biomass densification, aiming to provide insights for the development and utilization of biomass energy.