Lower mould used for processing tyre rubber bladder

The utility model provides a lower mould used for processing a tire rubber bladder, and the technical proposal is that the surface of the inner cavity of the lower mould is separately distributed with a plurality of exhaust lines, and the riffled lines are distributed among the exhaust lines. The lower mould can be an integrated design, and the lower mould can be also composed of a lower mould body and periphery. Because the utility model designs the exhaust line and the riffled structure on the inner cavity of the lower mould, the handle strength and the life time of the tire rubber bladder processed by the mould are increased, and production cost of the tire is reduced.