Variable force key

A variable force key, comprising a housing, a central shaft, and a magnetic ring, wherein the central shaft extends into the housing, a top end of the center shaft is fixedly provided with a key cap seat, a return spring is arranged between a bottom end of the central shaft and an inner bottom surface of the housing, the central shaft is able to reciprocate in the housing in a vertical direction, the bottom end of the central shaft is further fixedly provided with a limit member, an outer wall of a bottom end of the limit member is provided with a flange in a circumferential direction, the magnetic ring is sleeved on an outer wall of the limit member and located at an upper end of the flange, or an inner wall of the bottom end of the limit member is provided with a flange in the circumferential direction, and the magnetic ring is arranged inside the limit member and located at the upper end of the flange, and the magnetic ring is a permanent magnet magnetized along an axial direction of the limit member, wherein the variable force key further comprises an electromagnet or a hollow coil, the electromagnet or the hollow coil is arranged at a bottom in the housing, and when the central shaft is moved downward, the electromagnet or the hollow coil is able to penetrate inside the limit member, and both a magnitude and a direction of current of the electromagnet or the hollow coil are able to be adjusted.