Metal air pipe capable of being pulled up

The utility model relates to the technical field of metal air pipes and discloses a metal air pipe capable of being pulled up, which comprises a metal air pipe body and a movable metal branch pipe connected with the rear end in the metal air pipe body in a sliding mode, a rectangular sliding groove is formed in the right side of an inner cavity of the metal air pipe body, and a positioning mechanism is arranged at the front end of the movable metal branch pipe. The positioning mechanism comprises a movable sliding frame fixedly connected with the outer wall face of the front end of the movable metal branch pipe, a positioning rubber pad fixedly connected with the rear wall face of the movable sliding frame and an extrusion square frame arranged on the rear side of the positioning rubber pad, and four square hole rotating pipes distributed in a matrix mode are rotationally connected to the four corners of the movable sliding frame. Outer threads are formed in the outer wall faces of the circumferences of the r