Deep hole pressure relief blasting cartridge plugging backstop

The utility model relates to the technical field of deep hole pressure relief blasting, in particular to a deep hole pressure relief blasting cartridge plugging backstop which comprises a pipe body, a notch is formed in the front end of the pipe body, three limiting mechanisms are movably connected to the inner wall of the notch, the ends, close to each other, of the three limiting mechanisms are jointly and movably connected with a grain, and the grain is movably connected with the pipe body. Four mounting grooves are formed in the rear portion of the outer surface of the tube body, the four mounting grooves are equidistantly distributed, non-return devices are fixedly connected to the inner walls of the four mounting grooves, the four non-return devices are equidistantly distributed, three limiting mechanisms are arranged to clamp a grain at the same time, static electricity can be prevented from making contact with the grain, and therefore the grain and the three limiting mechanisms form a whole. The four