NOVELTY - Treating rolling steel waste emulsion includes preparing a microorganism culture medium; culturing microbial strains, performing primary amplified cultivation to the microbial strains, performing secondary amplified cultivation to the microbial strains, maintaining the strain liquid in the primary treatment tank, injecting domestic sewage, maintaining the secondary treatment tank, injecting domestic sewage and industrial water to the tank, and opening the first and third air valves; and opening the air valves, aerating the treatment tanks and the waste emulsion tank at the same time.    USE - Method for treating rolling steel waste emulsion (claimed).    ADVANTAGE - The method is simple, has cost, and achieves emission standard.    DETAILED DESCRIPTION - Treating rolling steel waste emulsion comprises:    (A) preparing a microorganism culture medium, taking a beaker, putting rolled oats (80-120 g) and dried yeast (7-9 g) to the beaker, adding rice washing water (350-550 ml) to stir the mixture into paste, and stirring the mixture once every 1.5 hours;    (B) culturing microbial strains, taking strains at corners of a domestic kitchen water tank using absorbent cotton after 6-7 hours, putting the taken strains on the culture medium, performing primary amplified cultivation after 24-26 hours;    (C) performing primary amplified cultivation to the microbial strains, taking one water bucket, adding industrial water (18-29 L), waste emulsion (80-90 ml) with a chemical oxygen consumption of less than 3000 mg/L, egg white of two eggs, and fish meal (100-150 g) to the water bucket, aerating by aeration pump micropores in an aeration amount of greater than 0.02 m3/minute, pouring the cultured microbial strain liquid into the water bucket for performing aeration amplified cultivation when detecting that the pH is in 6.5-8, the temperature is at 25-30 degrees C, and the dissolved oxygen is more than 2 mg/L, then adding waste emulsion (200-300 ml) every 24-30 hours, performing secondary amplified cultivation after 6 days, where the industrial water of the water bucket is satisfied with the following conditions: the temperature is at 20-35 degrees C, the pH is in 6.5-8, the chemical oxygen consumption is less than 1000 mg/L, the oil content is less than 50 mg/L, and the dissolved oxygen is more than 2 mg/L;    (D) performing secondary amplified cultivation to the microbial strains, opening the first water valve, starting the first water pump, injecting domestic sewage (0.4-0.6 m3) and waste emulsion (10-15 L) from the domestic sewage tank to the microorganism cultivation bucket, opening the first air valve to aerate the microorganism cultivation bucket in an aeration amount of greater than 0.1 m3/minute, pouring the primarily amplified microbial strain liquid into the microorganism cultivation bucket for performing aeration amplified cultivation, adding waste emulsion (6-8 L) to the microorganism cultivation bucket every 24 hours, opening the fourth water valve after 6 days and introducing microbial strain liquid (0.1-0.3 m3) to the primary treatment tank, then injecting waste emulsion (3-5 L) to the microorganism cultivation bucket, opening the fourth water valve after 24 hours and introducing 0.2 cubic microbial strain liquid into primary treatment tank, then injecting waste emulsion (0.2 L) to the microorganism cultivation bucket, and introducing all the microbial strain liquid in the microorganism cultivation bucket into the primary treatment tank after 24 hours;    (E) maintaining the strain liquid in the primary treatment tank, injecting domestic sewage (40-50 m3), industrial water (30-40 m3) and waste emulsion (2 m3) having the chemical oxygen consumption of less than 3000 mg/L in the waste emulsion tank to the primary treatment tank before feeding the secondarily amplified microbial strain liquid, mixing them in the tank, then opening the first and second air valves for performing aeration in an aeration amount of greater than 10 m3/minute, injecting waste emulsion (2 m3) and domestic sewage (2 m3) after 48 hours, then injecting waste emulsion (3 m3) and domestic sewage (3 m3) to perform microorganism treatment after feeding the microbial strain liquid and detecting that the chemical oxygen consumption of the liquid in the primary treatment tank is less than 150-180, and discharging the strain liquid to the secondary treatment tank when the treatment amount of the waste emulsion in the primary treatment tank achieves 6 m3 every 24 hours and the chemical oxygen demand (COD) is less than 150-180;    (F) maintaining the secondary treatment tank, injecting domestic sewage (50-65 m3) and industrial water (25-30 m3) to the tank, and opening the first and third air valves for aeration and standby, where the aeration amount is greater than 5 m3/minute; and    (G) opening the first to fourth air valves, aerating the primary and secondary treatment tanks and the waste emulsion tank at the same time, starting the second water pump, opening the third water valve and injecting the waste emulsion to the primary treatment tank, starting the first water pump at the same time, opening the second water valve and injecting the corresponding amount of domestic sewage to the primary treatment tank for performing hydration degradation treatment, rising the level of the secondary treatment tank while rising the level of the primary treatment tank, continuously injecting the waste emulsion in an injection amount of 5-6 m3 when detecting that each index of the water quality of the secondary treatment tank is qualified, rising the level of the secondary treatment tank, and discharging the qualified water from the discharge port of the secondary treatment tank.