Oblique starting extension structure of rectangular jacking pipe

The utility model discloses a rectangular jacking pipe inclined originating extension structure which comprises an enclosing structure, a supporting structure, a supporting structure, a supporting structure and a supporting structure, wherein the enclosing structure is arranged on the periphery of a jacking pipe working well; the inclined steel ring is pre-buried at the position of a tunnel portal in the jacking direction of the rectangular jacking pipe; the guide rail base concrete is arranged in the pipe jacking working well, a guide rail is installed on the guide rail base concrete, and a rectangular pipe jacking machine and linkage jacking iron are arranged on the guide rail; one end of the wedge-shaped extension steel ring is fixedly connected with the inclined steel ring, and the exposed end of the wedge-shaped extension steel ring is provided with a rib plate; the wedge-shaped rear backrest is arranged in the pipe jacking working well, a jack support is arranged on the inclined face side of the wedge-s