The utility model relates to a packer deblocking and decompressing switch. An outer reducing circular bead of an inner suspension pipe is suspended on an inner reducing circular bead of an outer suspension pipe; a pressure relief hole is arranged in the outer suspension pipe; when the outer suspension pipe and the inner suspension pipe are at a suspension state, an upper end face of the inner suspension pipe is located under the pressure relief hole; an upper seal ring and a lower seal ring are arranged on the inner suspension pipe; a lower part of an upper joint is connected with an upper part of the outer suspension pipe; an anti-rotating pin is arranged on a lower part of the outer suspension pipe; a cylindrical face under the outer reducing circular bead of the inner suspension pipe is milled to be a plane; an inner end of the anti-rotating pin is ejected on the milled plane of the inner suspension pipe; when the outer suspension pipe is moved downwards to enable the upper end face of the inner suspension pipe to be limited by a lower end face of the upper joint, the upper seal ring and the lower seal ring on the inner suspension pipe are located above and under the pressure relief hole; the inner suspension pipe covers the pressure relief hole; and when a packer is deblocked, the pressure relief hole is at an open state, and upper pressure and lower pressure of the packer are balanced, so that ground lifting equipment can lift a pipe column so as to enable the packer to be deblocked successfully, and a rubber barrel cannot be damaged or fall down when the packer is deblocked.