The invention discloses a long-life extruder nose which comprises a mouth die, an outer die, an inner die, a shunting body and a connecting body, wherein the inner die comprises an outer spindle and an inner spindle, the outer spindle is provided with a die hole, and the inner spindle is provided with a sizing part, an extruding part and a shaft part which are sequentially connected; a free end of the shaft part is provided with an extruding groove, and the inner spindle is provided with an airflow hole; a shunting frame is provided with a central hole; a thread hole is internally provided with a thread regulating piece, and the tail end of the thread regulating piece is provided with a frustum part; the thread regulating piece is provided with an air inlet hole; the inner spindle is arranged in the die hole of the outer spindle and the central hole of the shunting frame; the extruding groove of the inner spindle shaft is extruded by the frustum part; and the air inlet hole is communicated with the airflow hole of the inner spindle. According to the long-life extruder nose, a distance between the inner spindle of the inner die and the inner wall of the cavity of the outer die is regulated by utilizing the thread regulating piece, so that the service life is not only can be prolonged, but also pipes in different specifications can be produced. The invention also provides an automatic extruding system which comprises a wall thickness detector, a servo motor, a wall thickness adjustment controller and the long-life extruder nose, wherein the servo motor is connected with the thread regulating piece.