Self-anchored packer

The utility model relates to a self-anchored packer. Wherein two ends of the central pipe are respectively in threaded connection with the upper joint and the lower joint; an upper locking mechanism and a lower anchoring mechanism are arranged on the central pipe; the upper locking mechanism comprises an outer cylinder sleeve connected to the outer side of the upper joint; steps are arranged on the central pipe, a pressure transmission groove extending up and down is formed in the step; a cone cap is assembled on the upper side of the step; a cone is fixedly connected to the cone cap; the cone is in clearance fit with the central pipe to form a cone pressure transmission channel; the central pipe is arranged on the upper side of the step and the inner side of the cone cap is sleeved with a rubber sleeve; the rubber sleeve is in clearance fit with the central pipe; a rubber sleeve is sleeved on the rubber sleeve sleeve, a piston assembly is assembled between the central pipe and the outer cylinder sleeve, the