The invention provides a liquid biological 
organic fertilizer with high content of organic substances and a preparation method. The 
fertilizer is characterized by comprising the following components by weight: 60% of a 
humic acid release inhibitor, 0.4% of a composite 
biological agent, 10% of 
fulvic acid potassium, 12% of 
soluble nitrogen-
phosphorus-
potassium raw materials, 9% of a chelating medium 
trace element agent, 8.47% of a 
soil conditioner, 0.93% of compound 
sodium nitrophenolate and 0.1% of 
naphthalene acetic acid; and the 
fertilizer is prepared by mixing, heating, chelating, concentrating, cooling, 
microorganism adding, filtering and residue removing. The invention has the following beneficial effects: 
plant nutrition is directly supplemented; the contents of absorbable organic substances for a 
root system in soil are rapidly supplemented; growth of the 
root system is rapidly promoted; absorption area of the 
root system is enlarged; the chelating medium 
trace element agent can not be fixed by the soil and exists in a 
free state in the soil, so the chelating medium 
trace element agent is easy to be captured and absorbed by the root 
system in the soil; physiological diseases and pests are prevented from occurrence; quality of an agricultural product is improved; root-rot 
disease and stem-rot 
disease are prevented from occurrence; occurrences of 
fusarium and 
verticillium wilts and 
bacterial wilt are reduced; meanwhile, the 
fertilizer is capable of resisting 
salinity and 
alkalinity, resisting 
continuous cropping diseases, and killing soil-borne diseases.