A novel rotating packed bed（RPB）technology was used to prepare butyl rubber for the first time.The effects of the operating parameters，such as rotate speed，polymerization temperature，on the molecular weight and molecular weight distribution of isobutylene-isoprene rubber（IIR）were investigated in the experiment.The results revealed that IIR prepared by the unique high gravity reaction technology with the molecular weight of 2.89×105，molecular weight distribution index of 1.99 and single-pass conversion 30% was obtained at N=1200 r·min-1，Tp=-100℃ in the experimental condition.In addition，the mean residence time of the products was less than 1s while that of the conventional technology was 30—60 min.The production efficiency per unit volume of the equipment was increased by 2—3 orders of magnitude.With increasing N and decreasing Tp，the molecular weight of IIR increased whereas no obvious difference of the distribution index of molecular weight was observed.