Rivet filling structure of riveting gun

The utility model relates to the technical field of riveting guns, and discloses a rivet supplementing structure of a riveting gun, which comprises a gun body, a rivet seat support, a rivet seat, a rivet sliding pipe and a rivet sliding pipe support, a pull head is arranged in the gun body, one end of the rivet seat support is rotatably connected with the rivet seat, the other end of the rivet seat support is fixedly connected with the rivet sliding pipe support, and the rivet sliding pipe support is fixed at the front end of the gun body. The rivet sliding pipe is of a separated structure and comprises an upper rivet sliding pipe and a lower rivet sliding pipe, the upper rivet sliding pipe is fixedly connected with the rivet sliding pipe support, an upper end inlet of the upper rivet sliding pipe is connected with the rivet feeding hose, a lower end outlet of the upper rivet sliding pipe corresponds to an inlet of the lower rivet sliding pipe, and an outlet of the lower rivet sliding pipe is fixedly connecte