Temporarily-closed packer

The invention discloses a temporarily-closed packer. The lower end of an upper joint is connected with the upper end of a middle joint in a threaded manner and fixed through a fixing pin, the lower end of the middle joint is connected with the upper end of an upper rubber barrel seat in a sleeved manner through an upper inner protection cap, a rubber barrel is arranged on the lower portion of theupper rubber barrel seat and connected through the upper end of an upper steel ring in a threaded manner, the lower end of the rubber barrel is connected with a lower rubber barrel seat in a threadedmanner through a lower steel ring, a first liquid incoming passage is arranged at the lower end of a central pipe, and a pawl sliding sleeve is arranged on the lower portion of the lower rubber barrelseat. A structure with two ends floating is adopted, so that pressure bearing performance of the packer is ensured; the liquid incoming passage is controlled through the pawl sliding sleeve, so thatsetting in advance of the pa