NOVELTY - Treating wastewater comprises separating bacterial protein from wastewater using fermentation liquid comprising glutamic acid by a high speed separating machine, collecting bacterial protein, uniformly mixing bacterial protein with water, then placing in a fermentation device, adjusting the pH value using composite seed liquid, uniformly stirring the liquid, culturing to obtain a mature probiotic fermentation liquid, pumping the fermentation liquid into a bleaching tank, and carrying out decoloring treatment, then adding powdered activated carbon, concentrating and crystallizing.    USE - The method is useful for treating wastewater (claimed).    ADVANTAGE - The method is capable of economically treating the wastewater in an eco-friendly manner.    DETAILED DESCRIPTION - Treating wastewater comprises separating bacterial protein from wastewater using fermentation liquid comprising glutamic acid by a high speed separating machine at a rotating speed of 4000-5000 revolutions per minute (rpm), collecting bacterial protein, uniformly mixing bacterial protein with water, then adjusting the solid content of 15% and placing in a fermentation device, adjusting the pH value to 6-7 using 1/10 volume of composite seed liquid, uniformly stirring the liquid, culturing at a temperature of 32-34 degrees C for 24 hours to obtain a mature probiotic fermentation liquid, pumping the fermentation liquid into a bleaching tank, carrying out decoloring treatment at a temperature of 45-50 degrees C for 30 minutes, then adding 1.5 mass% of powdered activated carbon, then concentrating and crystallizing for 1 time, carrying out solid-liquid separating, then sedimenting to obtain a supernatant, and discharging the supernatant into a sewage processing system, then adding composite microorganism microbial inoculum and treating. The composite microorganism microbial inoculum comprises 10 pts. wt. yeast, 7 pts. wt. Bacillus subtilis, 6 pts. wt. Bacillus megaterium, 5 pts. wt. denitrifying bacteria, 5 pts. wt. Pseudomonas aeruginosa, 4 pts. wt. Rhodococcus, 3 pts. wt. Phanerochete chrysosporium as active components.