Described are an oscillation amplitude control component, home electrical equipment and an oscillation amplitude control method and device. The component includes: a V-shaped grooved gear (110), a pressure pump, a roller (120) with a pre-formed groove and a transmission belt (130); the V-shaped grooved gear (110) includes a central shaft and two conical plates; lateral surfaces of two conical plates and the central shaft enclose a V-shaped groove; a gear is arranged on a circumference of a conical plate and joined with an oscillating switch selectively; the transmission belt (130) is configured to surround the V-shaped groove and the pre-formed groove; two conical plates regulate a surrounding radius of the transmission belt (130) surrounding the V-shaped groove under control of pressure generated by the pressure pump; the roller (120) is fixed in an oscillating plate, and controls an oscillation amplitude of the home electrical equipment through the oscillating plate.