NOVELTY - Forming heavy metal treating agent involves regulating solid content of municipal sludge, adding into antifoaming agent, regulating pH by acid/alkali, sterilizing and cooling; inoculating thermophilic coryneform bacteria into bottle filled with beef extract peptone liquid culture medium, performing shaking culture; transferring shaking bacterial liquid of the bacteria into seed tank, performing fermentation culture; transferring seed solution of the bacteria into fermentation tank; performing post-treatment on fermentation liquor; adding antiseptic into concentrated solution and stirring.    USE - For preparing heavy metal treating agent (claimed); and for treating the etching waste liquor.    ADVANTAGE - The method provides recycling treatment way for the municipal sludge, and also reduces the production cost of heavy metal treating agent. The heavy metal treating agent reduces the content of copper ion in the etching waste liquor.    DETAILED DESCRIPTION - Preparing heavy metal treating agent involves conditioning sludge: regulating the solid content of the municipal sludge to 2-5%, adding into antifoaming agent (1-5 g/l), regulating the pH value to 6.5-8 by acid or alkali, after stirring uniformly, sterilizing and cooling the product at 30-35 degrees C for future use; performing shaking culture: inoculating thermophilic coryneform bacteria into bottle filled with beef extract peptone liquid culture medium, performing shaking culture, where the culture conditions are as follows: the temperature is 28-32 degrees C, the rotating speed is 150-250 r/min, the liquid amount in the bottle is 20-40%, and the culture time is 8-12 hours; fermenting in seed tank: transferring a shaking bacterial liquid of the thermophilic coryneform bacteria into a seed tank, under the inoculation amount of 1-3%, performing fermentation culture, where the culture conditions are as follows: the temperature of the tank is 28-32 degrees C, the pressure of the tank is 0.02-0.06 MPa, the ventilation volume amount per min is 1-1.5 folds of the volume of the culture medium, the stirring speed is 200-260 r/min, and the fermentation time is 8-12 hours; fermenting in a fermentation tank: according to inoculation amount of 2-8%, transferring the seed solution of the thermophilic coryneform bacteria into fermentation tank, where the culture conditions are as follows: the temperature of the tank is 28-32 degrees C, the pressure of the tank is 0.02-0.06 MPa, the ventilation volume amount per min is 1-1.5 folds of the volume of the culture medium, the stirring speed is 180-220 r/min, and the fermentation time is 30-42 hours; performing post-treatment on the fermentation liquor: after finishing fermenting, regulating the pH value to 4-4.5 by inorganic acid, concentrating the fermentation liquor by high-speed centrifugal process, where the concentration fold is 1-5 folds; adding an antiseptic (0.2-2 g/l) into the concentrated solution, stirring uniformly, separately packaging for obtaining heavy metal treating agent liquid product.