The utility model relates to a sulfonation reaction system for producing surface -activeagent, include: vapour and liquid separator and head tank are connected to the sulfonator respectively, the lower extreme of sulfonator is connected to centrifuge, centrifuge is connected to the tail gas recycling absorption tower, the inside heat exchanger that is equipped with in tail gas recycling absorption tower, the top of heat exchanger is equipped with first filler, the top of first filler is equipped with the second and packs, the lower extreme on tail gas recycling absorption tower is equipped with the circulating line, the end of circulating line is equipped with a plurality of atomizing nozzle, many atomizing nozzle stretch into in the tail gas recycling absorption tower, and lie in between first filler and the second filler, each atomizing nozzle includes a main burner and a ring nozzle, main burner and the inside a plurality of connecting holes intercommunication that passes through of ring nozzle, and the contained angle between main burner export terminal surface and the ring nozzle export terminal surface is the acute angle. A sulfonation reaction system for producing surface -activeagent can thoroughly absorb tail gas through above -mentioned structure to reduce environmental pollution.