Hook type packer for annulus pipeline

The invention provides a hook type packer for an annulus pipeline. The hook type packer comprises a hook, a reducing stop block and a main ring body, wherein the main ring body comprises a pressing ring and a base ring; the pressing ring and the base ring are vertically and coaxially arranged in sequence from top to bottom; the hook is vertically arranged in an annulus area; the lower end of the hook is fixedly connected with the base ring, and the upper end of the hook is fixedly connected with a protective pipe; an annular gap is reserved between the pressing ring and the base ring; a guide body and the reducing stop block are arranged in the annular gap; the pressing ring can vertically move up and down relative to the base ring along the guide body; the reducing stop block is movably arranged on the guide body in the circumferential direction in a sleeving mode; and under the action of gravity, the pressing ring makes contact with and extrudes the reducing stop block downwards along a pin, and the reducin