Packer and method for manufacturing packer

The invention discloses a packer and a manufacturing method of the packer, and belongs to the field of oil and gas equipment. The packer comprises an expansion pipe, at least two sealing rings and a columnar expansion body. Each sealing ring comprises a rubber pipe and a metal ring located on the rubber pipe. When the packer is used for packing, the columnar expansion body can move towards the first pipe section of the expansion pipe so as to open the expansion pipe from the inner side of the expansion pipe, so that the expansion pipe is expanded, the outer diameter of the expansion pipe is increased, the outer diameter of the sealing ring arranged on the expansion pipe in a sleeving mode is increased accordingly, and the sealing ring can abut against a sleeve to form sealing; the seal is jointly formed by the deformed expansion pipe, the rubber pipe and the metal ring on the rubber pipe, the structure is stable, the sealing performance is high, and the packer can keep good sealing performance under various w