Rubber sleeve supporting device of large-diameter-expansion open-hole well packer

The invention relates to a rubber sleeve supporting device of a large-diameter-expansion open-hole well packer. A lock shaft and the rear end of a cone are in one-way motion connection, and the frontend of the cone is provided with a first inclined surface; the rear end of a support block is provided with a second inclined surface, and the front end of the support block is a support surface for ejecting a shoulder of a rubber cylinder; the cone is pressed to move along the shaft towards the rubber cylinder, so that the support block does radial expansion motion until the support block is attached to the inner wall of an open-hole stratum; and meanwhile, the support surface ejects the shoulder of the rubber cylinder and prevent the rubber cylinder from deforming. The rubber sleeve supporting device can effectively protect the rubber cylinder of the packer, effectively prevents the condition that the rubber cylinder of the large-diameter-expansion open-hole well packer suffers from shoulder protrusion damage du