NOVELTY - Improving bio-leaching effect of ash generated from the combustion of urban domestic garbage comprises: (a) selecting a circle of silicate-inclined bacterial strain with good activity; (b) inoculating 1-5% (v/v) of the seed liquid into the silicate bacteria liquid culture medium; (c) carrying out a slant culture on the Aspergillus niger in potato-dextrose-agar (PDA) culture medium at 25-35 degrees C for 5-7 days to grown matured spore; and (d) inoculating the Aspergillus niger spore suspension (c) into cane sugar liquid culture medium.    USE - The method is useful for improving bio-leaching effect of ash generated from the combustion of urban domestic garbage (claimed).    ADVANTAGE - This method is simple, high-efficiency, economical, feasible and safe, which is an effective and environment-friendly method to remove heavy metal from ash from burning garbage; besides, the extraction toxin is far lower than the standard of dangerous waste identification; the ash is fed into a landfill yard or recycled.    DETAILED DESCRIPTION - Improving bio-leaching effect of ash generated from the combustion of urban domestic garbage comprises: (a) selecting a circle of silicate-inclined bacterial strain with good activity, inoculating it into 10-50 ml of seed culture medium, shaking and culturing it at a constant temperature of 25-35 degrees C at a rotating speed of 140-220 revolutions/minute; (b) inoculating 1-5% (v/v) of the seed liquid into the silicate bacteria liquid culture medium, controlling the amount of the culture medium at 15-30% (v/v) of the culture vessel, shaking and culturing it at a constant temperature of 25-35 degrees C at a rotating speed of 140-220 revolution/minute for 2-7 days, after the silicate bacteria grows in logarithmic phase, adding 10-30 g/L of ash, keeping shaking and culturing it for 5-7 days for bio-desilication; (c) carrying out a slant culture on the Aspergillus niger in PDA culture medium at 25-35 degrees C for 5-7 days to grown matured spore, washing off the spore with aseptic de-ionized water and counting the spore suspension with a hemacytometer and regulating the concentration of spore to 1x107-2x108/ml with aseptic de-ionized water; and (d) inoculating the Aspergillus niger spore suspension (c) into cane sugar liquid culture medium till the spore concentration reaches 0.5-2.5x107/ml, feeding 10-80g of bio-desilicated ash (b) into every liter of liquid culture medium and shaking and leaching it at a constant temperature of 25-35 degrees C at a rotating speed of 140-220 revolution/minute for 15-25 days.