NOVELTY - Producing biologically fermented complex fertilizer by fermenting glutamic acid fermentation wastewater, comprises filling wastewater into a multiple-effect evaporator, concentrating, reducing the volume to form a concentrated wastewater, dissolving inorganic elements e.g. nitrogen into wastewater to obtain a saturated solution, mixing the concentrated glutamic acid wastewater with the saturated solution to obtain a slurry, filling into a granulator, filling hot air, continuously atomizing, fluidizing and granulating to obtain granular biologically fermented complex fertilizer, and sieving.    USE - The method is useful for producing biologically fermented complex fertilizer by fermenting glutamic acid fermentation wastewater.    ADVANTAGE - The method: overcomes the problem of coking and decomposition of organic elements at high temperature during slurry spraying and granulating process; prevents secondary air pollution and soil pollution caused by carbide; and creates a new path to achieve zero emission of organic wastewater.    DETAILED DESCRIPTION - Producing biologically fermented complex fertilizer by fermenting glutamic acid fermentation wastewater, comprises: (i) filling the bacterial protein-removed glutamic acid fermentation wastewater into a multiple-effect evaporator for concentrating the wastewater, reducing the volume to form a concentrated glutamic acid wastewater, whose solid content is 40-50% (wt./wt.); (ii) dissolving inorganic elements e.g. nitrogen, phosphorus and potassium into the m bacterial protein-removed glutamic acid fermentation wastewater to obtain a saturated solution; (iii) mixing the concentrated glutamic acid wastewater (75-90%) with the saturated solution (10-25%) to obtain a mixed slurry solution; and (iv) filling the mixed slurry solution into an spray dryer fluidized bed granulator, using saturated steam to heat a heater inside the spray dryer fluidized bed granulator, simultaneously filling hot air of 190 plus minus 210 degrees C, continuously atomizing, fluidizing and granulating to obtain granules to obtain granular biologically fermented complex fertilizer, sieving and cooling to obtain a qualified product.