Speed reducer box body with gear shaft convenient to replace

The utility model relates to a speed reducer box body with a gear shaft convenient to replace, which comprises a casing, square holes are arranged on two sides of the casing, square plates are arranged in the square holes, sealing strips are arranged on four sides of the square plates, first puller bolts are arranged on the upper sides of the square plates, second puller bolts are arranged on theright sides of the square plates, and square pressing rings are arranged on the outer sides of the square plates. The square pressing ring is connected with the machine shell and the square plate in abolted mode, an annular table hole is formed in the square plate, a conical plug is arranged in the annular table hole, top nails are evenly arranged on the conical plug, and the conical plug is connected with the annular table hole in a bolted mode. The square plates on the two sides of the machine shell are matched with the square holes in an inserted mode, the square plates are connected withthe square holes through th