NOVELTY - Method for promoting drying of residue silt by microorganism involves carrying out anaerobic fermentation of biological organic substance, diluting fermented liquid, spraying diluted fermented liquid to the substrate, inoculating microorganism to the substrate, decomposing the substrate, placing packaged substrate at bottom stack, pre-embedding drainage plate, connecting draining board with vacuum pipe, adding e.g. to-be-processed sludge residue silt to mud-conveying pipe, precipitating mud particle, and storing anaerobic fermented substrate sludge.    USE - The method is useful for promoting drying of residue silt by microorganism (claimed).    ADVANTAGE - The method enables to make silt loose and porous and promotes flow of moisture, thus improves the water pumping and drainage effect of vacuum preloading, and transforms residue silt from fluid state to plastic state or semi-solid state rapidly. The method is rapid and cost-effective and requires short period of time.    DETAILED DESCRIPTION - Method for promoting drying of residue silt by microorganism involves carrying out anaerobic fermentation of biological organic substance in the anaerobic sealed environment, collecting fermented liquid, adding water and diluting the fermented liquid, using biological organic as substrate to form internal anaerobic environment, spraying the diluted fermented liquid to the substrate, inoculating anaerobic gas generating microorganism to the substrate, decomposing mixture, decomposing the substrate by water, packing and sealing mixture, uniformly placing packaged substrate at bottom stack, pre-embedding drainage plate in the stack, connecting draining board with the vacuum pipe, where the vacuum pipe comprises network system, adding to-be-processed sludge residue silt, flocculating agent and coagulant aid to the mud-conveying pipe, precipitating mud particle, discharging source water, repeating the steps, storing anaerobic fermented substrate sludge in yard for 10-20 days to generate large amount of bubbles, where vacuum pumping pipeline of main pipe is connected with the vacuum machine set, vacuum pre-pressing water, pumping water, and vacuum pre-pumping water.