Biomass wood pellets are the cold dense forming processes of crushed biomass straw, forestry waste and other raw materials by the pellet mill using pressure rollers and ring die. Biomass wood briquettes are extruded by the briquettes machine under normal temperature conditions through the huge pressure of the head and die. The density of raw materials is generally 0.1-0.13t/m3, and the density of formed pellets is 1.1-1.3t/m3, which is convenient for storage and transportation, and greatly improves the burning performance of biomass.