Fuente: WIPO "circular economy" The invention discloses a process for ecologically treating wastewater generated in the harmless treatment process of animals died of illness, relates to the technical field of environmental protection, and aims to solve the problem that in the treatment process of the current harmless treatment process of the animals died of illness, particularly in the aeration stage, foul gas is easy to leak to form secondary pollution, and the treatment effect is poor. The method comprises the following steps: pretreatment: sequentially carrying out solid-liquid separation, precipitation and filtration on the condensed wastewater through equipment to remove large-particle impurities and suspended solids in the wastewater, dilution treatment: adding water into the condensed wastewater according to a specific ratio to quickly reduce the odor of the wastewater, and carrying out filtration and filtration on the condensed wastewater to remove large-particle impurities and suspended solids in the wastewater; according to the method, the odor of the wastewater is reduced through dilution, the situation of secondary pollution caused by leakage of the malodorous gas is reduced, bacteria and algae are matched for treatment, and generation of derivative waste such as waste gas and sludge in the wastewater treatment process is greatly reduced.