The invention relates to a composite double-layer rubber barrel. According to the composite double-layer rubber barrel, a hollow-out hard rubber barrel body is adopted, a hard rubber barrel and soft rubber barrel composite technology is adopted, advantages of a hard rubber barrel and advantages of a soft rubber barrel are integrated, defects of the hard rubber barrel and defects of the soft rubberbarrel are overcome, a barrel body is made of an alloy material, a seal head is made of plastic, and the hard rubber barrel adopts a flip type rotating buckle and clamping buckle combined connectionstructure, so that the purposes of optimizing the overall performance of the rubber barrel, reducing material and use cost greatly, reducing the production amount of glass cement packaging waste greatly, and becoming a energy-saving, environment-friendly and resource-saving type product are achieved.