A keyboard key comprising: a shell, with a top and a bottom corresponding to the top, that is provided with an axle opening at the top and a guide track structure inside that is longitudinally parallel to the central axis of the axle opening; a movable terminal that is provided inside the shell and extends to form an arm spring; and an actuating lever extending through one end of the shell to a keycap, provided with a convex arm spring clamp on the side which comes into contact with the inner wall of the shell, with a pair of identical flat slopes on one side and coming into contact with the arm spring at a position 1 along the circumference of the actuating lever, and a pair of identical positioning slopes on the other side corresponding to forked ends of the arm spring and coming into contact with arm spring at a position 2 along the circumference of the actuating lever, that is threaded through the axle opening, can longitudinally move between an initial position and a trigger position, and is provided with a guiding structure comprising at least one track corresponding to the angle of the flat slope, wherein: the flat slope and the positioning slope extend laterally and away from the actuating lever and extend longitudinally to the bottom of the shell; the positioning slope is provided with a positioning structure recessing into the positioning slope; and when the actuating lever is at position 1 or position 2, the guiding structure joins the guide track structure. a shell, with a top and a bottom corresponding to the top, that is provided with an axle opening at the top and a guide track structure inside that is longitudinally parallel to the central axis of the axle opening; a movable terminal that is provided inside the shell and extends to form an arm spring; and an actuating lever extending through one end of the shell to a keycap, provided with a convex arm spring clamp on the side which comes into contact with the inner wall of the shell, with a pair of identical flat slopes on one side and coming into contact with the arm spring at a position 1 along the circumference of the actuating lever, and a pair of identical positioning slopes on the other side corresponding to forked ends of the arm spring and coming into contact with arm spring at a position 2 along the circumference of the actuating lever, that is threaded through the axle opening, can longitudinally move between an initial position and a trigger position, and is provided with a guiding structure comprising at least one track corresponding to the angle of the flat slope, wherein: the flat slope and the positioning slope extend laterally and away from the actuating lever and extend longitudinally to the bottom of the shell; the positioning slope is provided with a positioning structure recessing into the positioning slope; and when the actuating lever is at position 1 or position 2, the guiding structure joins the guide track structure. the flat slope and the positioning slope extend laterally and away from the actuating lever and extend longitudinally to the bottom of the shell; the positioning slope is provided with a positioning structure recessing into the positioning slope; and when the actuating lever is at position 1 or position 2, the guiding structure joins the guide track structure.