NOVELTY - Method for preparing organic bacterial liquid involves selecting and screening strain from raw material of organic fertilizer, inoculating the screened strain in basic culture medium, culturing the inoculated strain and observing the growth of the strain, culturing the obtained strain in selective culture medium, adding the culture strain in a Klinefelter bottle, culturing the strain and adding sterile water to prepare strain suspension, inoculating the strain suspension in selective culture medium and performing fermentation.    USE - The method is useful for preparing organic bacteria liquid which is used as mother culture in the production of a microbial fertilizer or directly used as a seed-dressing agent (all claimed).    DETAILED DESCRIPTION - Method for preparing organic bacterial liquid involves (a) selecting strain from raw material of organic fertilizer, separating the selected strain including Bacillus, Saccharomycetes, filamentous fungi, photosynthetic bacteria, and lactic acid strain by counting and analyzing process, screening the separated strain, and determining the highest efficiency of the strain as the core strain under the indoor, (b) inoculating the obtained strain chosen from photosynthetic bacteria, lactic acid bacteria, and actinomycete strain in basic culture medium comprising 1.1-2% beef extract, 1.1-2% peptone, and 0.55-0.65% agar, where the pH of the medium is regulated to 6-8.5, culturing the strain with rotation speed of 160-190 revolutions/minute, and changing the components of culture medium and observing the growth of the strain to determine the inoculation amount of the strain, (c) culturing the strain in selective culture medium at 28 degrees C for 72 hours, and refrigerating the cultured strain, (d) adding the obtained culture strain in a Klinefelter bottle and culturing the strain at 36-45 degrees C for 72 hours, and adding 250 ml sterile water to the Klinefelter bottle under aseptic condition to prepare strain suspension, inoculating the obtained strain suspension in 50-60% selective culture medium and performing fermentation at 36-45 degrees C with stirring speed of 150-250 revolutions/minute to prepare first level seed liquid, adding the obtained seed liquid and 10-12% selective culture medium into fermentation tank, and performing fermentation at 36-45 degrees C with liquid flow rate of 0.5-1 and rotation speed of 150-250 revolution/minute for 72 hours, until the bacterial count reaches 5 billion viable cells/ml or more. An INDEPENDENT CLAIM is included for organic bacterial liquid which is prepared by the above-mentioned method.