NOVELTY - Preparing bio-organic fertilizer includes adding (S101) the chicken manure with chlorine-free microbial inoculum and water; putting (S102) the chicken manure, microbial inoculum and the mixed chlorine water in the sealed container, and fermenting; heating (S103) the fermentation product, killing harmful pathogenic bacteria and ovum; ultrasonic processing (S104) the fermentation product, dissolving the organic mass, fermenting the mixture, and taking centrifugal separation; and sand filtering (S105) the supernatant to obtain the water soluble bio-organic liquid fertilizer.    USE - Method for preparing bio-organic fertilizer (claimed).    ADVANTAGE - The method is simple and environment-friendly, and has convenient operation and low energy consumption.    DETAILED DESCRIPTION - Preparing bio-organic fertilizer comprises:    (A) adding the chicken manure (S101) with chlorine-free microbial inoculum and water, where the weight ratio of the chicken manure, microbial inoculum, and chlorine-free water is 100:0.4-0.6:300-500;    (B) putting (S102) the chicken manure, microbial inoculum and the mixed chlorine water in the sealed container, adjusting and maintaining the inner temperature at 30-40 degrees C, and fermenting for 7-10 days;    (C) heating (S103) the fermentation product to make the organic components in water, killing harmful pathogenic bacteria and ovum;    (D) ultrasonic processing (S104) the fermentation product for 6-8 hours, dissolving the organic mass, fermenting the mixture by a centrifuge, and taking centrifugal separation to obtain the supernatant; and    (E) sand filtering (S105) the supernatant to obtain the water soluble bio-organic liquid fertilizer.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram of the method for preparing bio-organic fertilizer (Drawing includes non-English language text).    Chlorine-free microbial inoculum and water adding step (S101)    Putting step (S102)    Heating step (S103)    Ultrasonic processing step (S104)    Sand filtering step (S105)