The invention relates to the technical field of biomass fuel and aims at providing a preparation method of biomass particle carbon with a high calorific value and a low clinkering rate. The preparation method of the biomass particle carbon is characterized by comprising the following steps of: raw material pretreatment, extrusion forming and carbonization refining, wherein the carbonization refining is to heat a biomass particle after the extrusion forming under an air isolated condition, carbonize the biomass particle and remove impurities such as sulfide in the biomass particle; the biomass particle carbon comprises the following raw materials in parts by weight: 20-30 parts of crop straw, 10-20 parts of bagasse, 30-40 parts of bamboo scrap, 80-90 parts of wood chip, 4-5 parts of flame accelerator, and 3-4 parts of anti-slagging agent. The biomass particle carbon prepared by the method has the high calorific value and the low clinkering rate.