Granary local blocking fumigation device

The invention discloses a granary local blocking fumigation device. The granary local blocking fumigation device comprises a running track, two evenly-distributed anti-disengaging rods are inserted into the middle of the running track, a moving wheel is rotationally connected with the middle of each anti-disengaging rod, moving wheel supporting rods are arranged on the two sides of each moving wheel, and a fixing plate is fixedly connected to the bottom ends of the moving wheel supporting rods. A lower pressing block is arranged at the bottom of an electric telescopic rod, a lower pressing plate is connected to the bottom of the lower pressing block, a square local blocking pipe is arranged at the bottom of the lower pressing plate, four evenly-distributed lower inserting pieces are arranged at the bottom end of the square local blocking pipe, a fumigation box is fixed to the middle of the bottom face of the lower pressing plate, an extending fumigation pipe is arranged below the fumigation box, a lower plug