Packer around middle layer

The invention belongs to the technical field of oilfield downhole tools, and particularly relates to a packer around a middle layer. The packer comprises an upper packer body, a middle communicating pipe column and a lower packer body, the middle communicating pipe column communicates the upper packer body with the lower packer body, the upper packer body and the lower packer body are set througha casing pipe in a pressurizing mode, the middle communicating pipe column comprises a double-wall pipe, the double-wall pipe is sleeved with an expansion type rubber sleeve assembly, the double-wallpipe is provided with a liquid through hole A which is used for introducing the internal pressure of the double-wall pipe into the outer part of the double-wall pipe and enabling an expansion type rubber sleeve assembly to expand, a setting driver which is used for driving the expansion type rubber sleeve to set is inserted into the double-wall pipe in a sealing manner, and the setting driver is made of a soluble material.