The objective of this research was to design and construction of standard wet scrubber of SO2 with recirculated for fumigation fresh longan and promote the process of SO2 fumigation for industrial. The SO2 wet scrubber was designed capacity by volume of SO2 fumigation room. The efficiency study of the designed wet scrubber was divided into two parts. The first part was to study factors affected the scrubbing efficiency, e.g., SO2 intake flow rate, SO2 absorbing solution flow rate and type of SO2 absorbing solution. The second part was to study optimized scrubbing process with SO2 absorbing recirculated. The study shows that the optimized gas flow rate was 165 cubic foot per minute against the double alkali solution (calcium hydroxide and sodium hydroxide) at the slurry flow rate was 70 liter per minute yielded the best result. The recirculated of scrubbing gas was found increase scrubbing efficiency by lowering the final SO2 concentration below the environmental standard within 10 minutes. The standard wet scrubber with recirculated process gave increasing percentage of the efficiency more than circulated process at the level of SO2 concentration 5,000 10,000 and 15,000 from 65.01 76.58 and 59.60%, respectively to 96.52 98.96 and 87.20%, respectively. However the recirculated process used more than preservation time. This output of this research can be used as prototype for standard wet scrubber of SO2 with recirculated, which high efficiency and environment friendly for SO2 fumigation processors and industry.