Abstract: A responsive mouse click mechanism includes a body (100), a key (200), and an elastic member (300). A switch (110) is arranged in the body (100). The key (200) includes an extension arm (210), one end of the extension arm (210) is pivotally connected to the body (100), and the other end of the extension arm (210) is in contact with the switch (110). The elastic member (300) is connected between the body (100) and the extension arm (210). The elastic member (300) pushes the extension arm (210) and a moment is thereby loaded on the extension arm (210) to preload pressure on the switch (110) without triggering the switch (110).