The cost of pig breeding enterprises in China remains high and the benefits are declining. How to reduce costs and increase efficiency is an important practical problem faced by pig breeding enterprises at present. This paper takes New Hope Group as the research object, based on its aquaculture management model and financial data, deeply reveals the problems in its large-scale aquaculture management and cost control, and defines the connotation and objectives of environmental cost control of aquaculture enterprises from the perspective of changing the engineering construction model; Secondly, it analyzes the current situation and problems of environmental costs in pig farms; Then put forward the optimization plan of environmental cost in three stages, namely, before, during and after the event. Finally, using the method of combining theory with practice, put forward that enterprises should build an environmental cost control system and supporting measures for the return of manure to farmland.