The invention provides a biological organic fertilizer. The biological organic fertilizer comprises the following raw materials in parts by mass: 20-25 parts of a nitrogen fertilizer, 5-7 parts of a potash fertilizer, 15-22 parts of a phosphate fertilizer, 1-3 parts of humic acid, 1-6 parts of straws, 2-4 parts of soybean meal, 6-8 parts of rice husk powder, 3-10 parts of clay, 0.5-3 parts of maifan stone, 4-8 parts of ground phosphate rock, 2-3 parts of peat soil, 1-2 parts of zeolite powder, 5-7 parts of earthworm feces, 0.03-0.1 part of strains, and 0.2-0.4 part of a seaweed extraction liquid. The biological organic fertilizer provided by the invention has the effective technical effects that proportioning of the above organic and inorganic components is performed according to a specialratio, the effective strains are added, so that industrial waste can be utilized in an environmentally-friendly manner; and in particular, the seaweed extraction liquid can make the strains stored for a long time, and the strains are uniformly dispersed into each inorganic component through mixing, so that the strains can better transfer beneficial components in the inorganic components, and thebiological organic fertilizer has high stability, high fertilizer efficiency, a long fertilizer effect, and lower costs.