NOVELTY - Method for comprehensive utilization of energy crops in fields of feeds, biogas and paper pulp, involves crushing stalk, fresh green leaves and tender stem portion of energy crops, adding silage agent to dried materials, providing mixture as feed to animals, fermenting the mixture containing stalk, transferring obtained filtrate to biogas fermentor, fermenting mixture, washing obtained residue with water, and processing residue into pulp.    USE - The method is useful for comprehensive utilization of energy crops in fields of feeds, biogas and paper pulp. The energy crops include Pennisetum, Sorghum, sweet Sorghum, Arundo donax, reed, sugarcane, Erianthus, sudangrass, Miscanthus, Aloe dichotoma, Dicranopteris, Arundinella hirta, corn, lemongrass, Spartina, rice straw, and switchgrass (all claimed).    DETAILED DESCRIPTION - Method for comprehensive utilization of energy crops in fields of feeds, biogas and paper pulp, involves (a) cutting energy crops which is 5-20 cm above the ground, and separating stalk, fresh green leaves and tender stem portion from cut crops, (b) crushing stalk, fresh green leaves and tender stem portion to 1-8 cm, drying crushed stalk, fresh green leaves and tender stem portion to a moisture content of 60-85%, adding silage agent to the dried materials, storing the mixture for 15-60 days, where the stored mixture is directly feed to animals, or drying to a moisture content of 5-25%, pulverizing dried mixture to 2 cm or less, adding animal nutrition additives to pulverized mixture, and providing as feed to animals, (c) crushing stalk to 3-15 cm, placing crushed stalk in a sealed container, adding water to container, adding 0.5-6% fermentation slurry to container, fermenting the mixture at room temperature or 30-60 degrees C for 2-6 days, and filtering the fermented mixture to obtain filtrate and residue, (d) transferring the obtained filtrate to biogas fermentor, and fermenting at a temperature of 30-60 degrees C until pH value reaches 6.5-8 for 5-35 days, where the fermented residue is used as fertilizer to grow energy crops, and (e) washing the obtained residue with water 2-5 times, and processing residue into pulp.