The present invention is production process and apparatus for the sulfonating reaction of petroleum fraction heavy alkyl arene and including dynamic centrifugal deposition and continuous deslagging. The present invention features that one automatic horizontal spiral centrifugal unloader is installed in the bottom of sulfonating reactor to unload slag while circulating material. The continuous deslagging process can reduce the free acid slag amount greatly, lower oil content in acid slag obviously, and inhibit the further oxidation and condensation of acid oil and the generation of side product, so as to raise the yield and quality of the destination product, reduce scaling, lower power consumption and prolong the service period of the apparatus.