Chemical industry as an important support for the economic development in our country creates a huge value economically, but along with this, it also has a negative impact on the environment and even spoils the life of the people. To achieve a healthy and sustainable development, chemicals manufacturers shall exercise effective cost management. This paper completely expounds the cost supervision and control of those manufacturers in the chemicals industry with the fuzzy AHP (Analytic Hierarchy Process) and other relevant theories on the account of real case, for example, a chemicals manufacturer in Langfang, Hebei. The findings show that the main business cost and the financial expenses of the chemicals manufacturers in China are so far roaring year by year. A system will be built for cost control indicators on five fronts such as financial data, internal production, employees, customers and environment. It turns out from computation that the cost control effect for the chemicals manufacturer M reaches a composite score 82, and the evaluation result is better. Among them, financial data and customers contribute more, and employees and environmental factors should be improved.