Governing type opener

The utility model discloses a T-shaped adjustable opener, which comprises an upper end opening portion and a lower end handle portion (1). The using method of the adjustable opener comprises the steps of adjusting the distance between a scratching knife (3) and a fixed needle (2), positioning, scratching and cutting with the scratching knife (3), and removing the cut part with a remover plate (4) to obtain a regular opening; and during service: adjusting and positioning the adjustable opener on an aluminum sheet of a bottle stopper (i.e. determining the distance between the scratching knife (3) and the fixed needle (2) via a sliding chute (6) and fixing with a fastening bolt), scratching and cutting with the scratching knife (3), and removing the cut part with the remover plate (4) to obtain a regular circle. The regular circle is used for dosing infusion fluid, and the size of the opening is adjusted in accordance with the diameter of the bottle stopper. A hanging pore (5) is used for connecting during hangi