NOVELTY - Biochar based soil conditioner comprises biomass carbon black and probiotics at wt.% ratio of (95.5-98.5):(1.5-4.5). The biomass carbon black is prepared by carbonizing agricultural wastes as biomass raw material at low temperature to form porous biomass carbon black. The probiotics is prepared by propagating microorganisms, fermenting to obtain probiotics solution, mixing and processing liquid-solid separation, and flash drying to obtain probiotics.    USE - Biochar based soil conditioner.    ADVANTAGE - The biochar based soil conditioner is prepared by microporous biomass carbon with strong adsorptive capacity and light absorption heating effect; and probiotics with high viable organism livability and can be preserved for long time at normal temperature. It has synergistic effect for fertilizer and capable of preventing soil-borne disease effectively.    DETAILED DESCRIPTION - Biochar based soil conditioner comprises biomass carbon black and probiotics at wt.% ratio of (95.5-98.5):(1.5-4.5). The biomass carbon black is prepared by carbonizing agricultural wastes as biomass raw material at low temperature to form porous biomass carbon black. The probiotics is prepared by propagating microorganisms, fermenting to obtain probiotics solution, mixing and processing liquid-solid separation, and flash drying to obtain probiotics. The microorganism is Bacillus, Trichoderma sp., Azotobacter, Rhizobium, phosphate-solubilizing bacteria, cellulose decomposition bacteria, antibiotics producing bacteria, or photosynthetic bacteria. An INDEPENDENT CLAIM is included for preparation of biochar based soil conditioner by carbonizing agricultural wastes at low temperature to form porous biomass carbon black; propagating microorganisms; fermenting to obtain probiotics solution; mixing and processing liquid-solid separation; flash drying to obtain probiotics; adsorbing and concentrating probiotics by taking biomass carbon black as core; and encapsulating via adhesive to obtain biochar based soil conditioner.