NOVELTY - A carbon-based compound fertilizer comprises probiotics organism containing carbon black biomass, and a probiotics agent. The biomass carbon black is prepared by taking agricultural wastes as biomass raw material; and performing the high-temperature carbonization to form porous biomass carbon black. The probiotics agent is prepared by enlarging the culture of beneficial microorganism; fermenting into probiotics liquid; mixing and separating liquid and solid; and obtaining the probiotics agent through the flash-steam drying.    USE - A carbon-based compound fertilizer (claimed) for agricultural development.    ADVANTAGE - The carbon-based compound fertilizer has strong absorption ability, good light absorption warming effect and high probiotics agent viable bacteria livability; provides synergistic effect; provides good slow release effect for long time; has low cost; and is economic and environment-friendly. The carbon-based compound fertilizer can be stored for a long time at the normal temperature and also can be mixed with other organic or inorganic fertilizers to granulate and dry and has no any influence.    DETAILED DESCRIPTION - A carbon-based compound fertilizer comprises probiotics organism containing carbon black biomass, and a probiotics agent. The biomass carbon black is prepared by taking agricultural wastes as biomass raw material; and performing the high-temperature carbonization to form porous biomass carbon black. The probiotics agent is prepared by enlarging the culture of beneficial microorganism; fermenting into probiotics liquid; mixing and separating liquid and solid; and obtaining the probiotics agent through the flash-steam drying. The beneficial microorganism is Paenibacillus polymyxa, Trichoderma, nitrogen-fixing bacteria, rhizobium, phosphate-solubilizing bacteria, potassium-solubilizing bacteria, cellulose decomposition bacteria, antibiotic-producing bacteria or photosynthetic bacteria. The agricultural wastes comprise salix mongolica stubbles, corns, soybeans, wheat, rice or straws. An INDEPENDENT CLAIM is included for preparation of the carbon-based compound fertilizer involving a) using the agricultural wastes as biomass raw material, and performing the high-temperature carbonization to form porous biomass carbon black; b) enlarging the culture of beneficial microorganism, fermenting into probiotics liquid, mixing and separating liquid and solid, and to obtain the probiotics agent through the flash-steam drying; c) taking the biomass carbon black as core, absorbing the probiotics agent, and to obtain the biomass carbon-based probiotics agent; and d) mixing the biomass carbon-based probiotics agent with the biomass carbon black and N, P and K ternary compound fertilizer, granulating into an organic-inorganic fertilizer granulator, coating the granulated material, drying in a drying machine, cooling and screening, and to obtain particle of carbon-based compound fertilizer.