Methanol is an important basic raw material for chemical industry. Methanol recovery project is of great significance to the construction of environmental protection projects and the improvement of China's modern industrial system. In a petrochemical company VOCx exhaust gas treatment project of methanol washing process as the research background, design based on ABB company AC800F DCS automatic control system for the methanol washing, after the system was put into operation, effectively improve the efficiency of the methanol washing recovery process, reduces the worker labor intensity, good results have been achieved in actual production.