This invention discloses an interior hinge arm for an aircraft boarding door, comprising a bracket, a linkage mechanism A, a linkage mechanism B, and an adjusting rotating sleeve. One end of the linkage mechanism B is telescopically connected to the adjusting rotating sleeve, and the other end is provided with the bracket rotatably connected thereto. One end of the linkage mechanism A is located inside the adjusting rotating sleeve and movably connected thereto, and the other end is provided with the bracket rotatably connected thereto. One bracket is installed on the interior trim, and the other is installed on the door. The length between the linkage mechanism B and the adjusting rotating sleeve is adjusted according to the installation space. When the door is opened, the linkage mechanism A and the adjusting rotating sleeve separate. When the door is released, the linkage mechanism A returns to its original position. By setting the linkage mechanism A, the linkage mechanism B, and the adjusting rotating sleeve, the hinge arm can adjust its length and spring back to its original position, giving it an automatic reset function and improving the application scenarios of the hinge arm.