The working way is pressed pellets from inside to outside, combined with centrifugal force and extrusion pressure, improve capacity and meanwhile to assure pellets hardness and density. Adopt 3-8 rollers special design to increase press rate and capacity, the mould is vertical double layer design, it can choose 2 moulds with same hole size, also can choose each mould different hole size to save the different size pellet mould cost.